Patent Publication Number: US-11641923-B2

Title: Cosmetic container with a capped seal

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application claims the benefit of and priority to U.S. Provisional Patent Application No. 62/756,949, filed Nov. 7, 2018 and titled COSMETIC CONTAINER WITH A CAPPED SEAL, and as U.S. Provisional Patent Application No. 62/910,606, filed Oct. 4, 2019 and titled COSMETIC CONTAINER WITH A CAPPED SEAL, the disclosures of each of which are incorporated herein by reference. 
    
    
     TECHNOLOGY FIELD 
     The present application relates generally to a cosmetic container, and in particular, a cosmetic container with a capped seal, and to methods of manufacturing cosmetic containers. 
     BACKGROUND 
     Devices exist for holding cosmetic or medicinal products. Some such devices comprise a tubular shell or bottle for holding a product, and a cap for closing the tube or bottle. In the cosmetics and personal care industries, these devices are used for containing a product to be applied to a body. Exemplary products include liquids, creams, gels, and various makeup and skincare products such as foundation, concealer, lotion serum, petroleum products, moisturizer, sunscreen, etc. For such devices, the construction may include an extruded tube with a molded structure on one end adapted to receive an applicator and cap, leaving the other end open for filling with a cosmetic or medicinal product. Once the tubular shell has been filled with the product, the tubular shell is typically crimped shut. The crimping process deforms the tubular shell which reduces the volume of the tubular shell, thereby effectively reducing the amount of product that can be contained within the tubular shell. Greater volume may be desirable, as well as alternative aesthetics and the ability to stand the container on its closed end. Accordingly, there remains a need for improved cosmetic containers and alternative manufacturing processes. 
     SUMMARY 
     This disclosure provides design, material, manufacturing methods, and use alternatives for cosmetic packaging. 
     In a first example, a cosmetic container may include a tubular sleeve which may define a cavity. The tubular sleeve may include a first end with a first opening and a second end with a second opening. The first opening may be defined by at least one upper sidewall which may include an inner side and an outer side and a lower end. The outer side may include outer threads or other connection structure, and the lower end may include an opening. The cosmetic container may include a cap assembly including a cap ring and a cap for placement at the second opening. The cap ring may include an inner side and an outer side, and the outer side may include outer threads. The cap ring may be adapted for placement adjacent to the second end of the tubular sleeve. In some examples the cap ring may be formed onto the tubular sleeve as by injection molding. The cap may have a bottom and an outer wall. The outer wall may include inner threads which may be configured to engage with the outer threads of the outer side of the cap ring. The second opening may allow access to the cavity of the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, engagement of the inner threads of the cap with the outer threads of the cap ring may seal the second end of the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, disengagement of the inner threads of the cap with the outer threads of the cap ring may open the second end of the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, an O-ring may be adapted for placement around the cap ring to provide a seal between the cap ring and the cap. 
     Alternatively or additionally to any of the examples above, in other example, the cap may include an inner wall. The inner wall may be adapted to engage with the second opening of the second end of the tubular sleeve. For example, the inner wall may extend into the cavity defined inside the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, the cap ring may include an annular ridge and a channel may be located between the annular ridge and the outer threads which may receive the O-ring, and the O-ring may have a thickness that is greater than the width between an inner wall of the cap and the channel of the cap ring to provide the seal. 
     In another example, a cosmetic container may include a tubular sleeve which may define a cavity. The tubular sleeve may include a first end with a first opening and a second end with a second opening. The first opening may be defined by at least one upper sidewall which may include an inner side and an outer side and a lower end. The outer side may include outer threads and the lower end may include an opening. The cosmetic container may include a cap assembly including an inner plug and an outer cap. The inner plug may be adapted to engage with the second opening. The inner plug may include cylindrical sidewalls and an upper closed end which may extend into the cavity of the tubular sleeve. The inner plug may include a lower open end which may include an outer ridge configured to engage with the second end of the tubular sleeve. The outer ridge may provide a stop for the inner plug, and the cylindrical sidewalls may adapted to engage with the tubular sleeve. The outer cap may have a bottom and an outer wall. The outer wall may include a first inner ridge configured to engage with the outer ridge of the inner plug. The second opening may allow access to the cavity of the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, engagement of the first inner ridge of the outer cap and the outer ridge of the inner plug may seal the second end of the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, disengagement of the inner ridge of the outer cap and the outer ridge of the inner plug may open the second end of the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, the outer cap may include an inner wall, and the inner wall may be adapted to engage with an inside of the inner plug. 
     Alternatively or additionally to any of the examples above, in another example, the inner plug may include a groove on an outer surface of the cylindrical sidewalls. 
     Alternatively or additionally to any of the examples above, in another example, an O-ring may be adapted to engage with the groove and may provide a friction fit between the inner plug and the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, the outer wall of the outer cap may include a second inner ridge. The first inner ridge may be placed below the second inner ridge along the outer wall, such that to place the outer cap over the inner plug and the tubular sleeve, the second outer ridge must first pass over the outer ridge and then the first outer ridge must pass over the outer ridge. The second outer ridge may pass over the O-ring before the first outer ridge passes over the outer ridge, as the outer cap is placed over the inner plug and second end of the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, the outer cap may engage with the inner plug in a snap-fit fashion. 
     Alternatively or additionally to any of the examples above, in another example, the outer wall of the outer cap may include a second inner ridge. The first inner ridge may be below the second inner ridge along the outer wall, such that to place the outer cap over the inner plug and the tubular sleeve, the second outer ridge may first pass over the outer ridge and then the second outer ridge may pass over the outer ridge. 
     Alternatively or additionally, the outer cap may further include an inner wall adapted to extend into the inner plug, stopping at or short of the upper closed end thereof. 
     Alternatively or additionally to any of the examples above, in another example, a cosmetic container may include a tubular sleeve which may define a cavity. The tubular sleeve may include a first end with a first opening and a second end with a second opening. The first opening may be defined by at least one upper sidewall which may include an inner side and an outer side and a lower end. The outer side may include outer threads and the lower end may include an opening, which may allow access to the cavity of the tubular sleeve. The cosmetic container may include a cap assembly including an inner cap and an outer cap. The inner cap may be adapted to engage with the second opening. The inner cap may include an inner wall and an outer wall which may be separated by a gap and joined by a lower rim. The outer wall may include a tab and an upper ridge. The inner wall may include a slot on an inner side of the inner wall, and the inner wall may be configured to extend into the cavity of the tubular sleeve. The lower rim may provide a stop for the inner cap. The outer cap may have a bottom, an inner wall and an outer wall. The inner wall may be adapted to engage with an inside of the inner cap. The outer wall may have an inner slot which may be configured to engage with the tab of the outer wall of the inner cap. The inner wall may have an outer ridge which may be configured to engage with the slot of the inner side of the inner wall. The inner cap may be attached for example by heat welding to the tubular sleeve, sealing the inner cap to the tubular sleeve prior to filling, and then the outer cap is attached thereover to hide the inner cap and seal the tubular sleeve following filling. 
     Alternatively or additionally to any of the examples above, in another example, engagement of the inner slot of the outer cap and the tab of the inner cap may seal the second end of the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, disengagement of the inner slot of the outer cap and the tab of the inner cap may open the second end of the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, the inner cap may be heat-welded to the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, the outer cap may engage with the inner cap in a snap-fit fashion. 
     Alternatively or additionally to any of the examples above, in another example, the outer cap may be threaded on to the inner cap. 
     Alternatively or additionally to any of the examples above, in another example, a method of filling a cosmetic container may include forming a tubular sleeve. The method may include filling the tubular sleeve with a cosmetic product and sealing the tubular sleeve with a cap assembly. 
     Alternatively or additionally to any of the examples above, in another example, a cosmetic container may include a tubular sleeve which may define a cavity. The tubular sleeve may have a first end with a first opening, and a second end with a second opening. The first opening may be defined by at least one upper sidewall, which may have an inner side and an outer side, and the outer side may include outer threads or other engagement structure. The first opening may include a receiving portion. The cosmetic container may further include a first applicator having an aperture. The first applicator may be configured to engage with the receiving portion at the first end of the tubular sleeve, such as by screwing on or snap-on. The cosmetic container may include a cap assembly which may have an inner cap and an outer cap. The inner cap may be adapted for placement adjacent the second end of the tubular sleeve, and the inner cap may have outer threads on an outer side of the inner cap. The outer cap may have a bottom and an outer wall, the outer wall may have inner threads which may be configured to engage with the outer threads of the outer side of the inner cap. The outer cap may include a stem which may be configured to extend into the cavity of the tubular sleeve. The second opening of the tubular sleeve may allow access to the cavity of the tubular sleeve. As an illustration, the first opening structure, including the receiving structure and outer side with threads, may be formed by inserting an extruded tube into a mold over a mandrel having a tapered end, and adding material via insert molding to form the receiving structure, outer side and threads onto the tube. The inner cap may be separately formed and placed inside the second end of the extruded tube, whereupon heat and/or pressure can be applied to secure the inner cap to the second end of the extruded tube. In an alternative, the inner cap at the second end of the tube may be formed first by insert molding the inner cap, and then placing a separately formed top piece inside the first end of the extruded tube and applying heat and/or pressure to secure the first end of the tube onto the top piece, wherein the top piece includes the outer threads and receiving structure. 
     Alternatively or additionally to any of the examples above, in another example, engagement of the inner threads of the outer cap with the outer threads of the inner cap may seal the second end of the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, the stem may include a second applicator. 
     Alternatively or additionally to any of the examples above, in another example, the cosmetic container may include a wiper which may be adapted for placement within the inner cap, and the stem may be configured to pass therethrough. 
     Alternatively or additionally to any of the examples above, in another example, disengagement of the inner threads of the outer cap with the outer threads of the inner cap may allow access to the second end of the tubular sleeve. 
     Alternatively or additionally to any of the examples above, in another example, the cosmetic container of claim may include a top cap, and the top cap may include inner threads which may be configured to engage with the outer threads of the outer side of the at least one upper sidewall. 
     Another illustrative, non-limiting example takes the form of a cosmetic container, comprising: a tubular sleeve defining a cavity and having a first end with a first opening and a second end with a second opening; a combined sidewall and dispenser structure attached to the first end of the tube, the sidewall having an inner side and an outer side and a receiving structure, the outer side including outer threads, the inner side attached to the sleeve, the dispenser having a passageway extending to at least a portion of an interior of the tubular sleeve; a cap assembly having an inner cap and an outer cap, the inner cap attached to the second end of the tubular sleeve, the inner cap having outer threads on an outer side of the inner cap; wherein the outer cap has a bottom and an outer wall, the outer wall having inner threads configured to engage with the inner threads of the outer side of the inner cap; and wherein the second opening allows access to the cavity of the tubular sleeve. 
     Alternatively or additionally, the tubular sleeve is an extruded tube having a thickness of about 0.1 to about 2 mm; the upper sidewall and dispenser structure is insert molded onto the first end of the tubular sleeve as a single piece; and the inner cap is insert molded onto second end of the tubular sleeve. 
     Alternatively or additionally the tubular sleeve is an extruded tube having a thickness of about 0.1 to about 2 mm; the upper sidewall and dispenser structure is insert molded onto the first end of the tubular sleeve as a single piece; and the inner cap is separately formed and then attached to the tubular sleeve using at least one of mechanical force, adhesive, or welding. 
     Alternatively or additionally the tubular sleeve is an extruded tube having a thickness of about 0.1 to about 2 mm; the inner cap is insert molded onto the second end of the tubular sleeve; and the upper sidewall and dispenser structure is separately formed and then attached to the tubular sleeve by at least one of mechanical force, adhesive, or welding. 
     Alternatively or additionally the dispenser comprises an exterior having at least one tab, slot or indentation for securing to an applicator adapted for securing to the dispenser using the at least one tab, slot or indentation, and the cosmetic container further comprises the applicator. Alternatively or additionally the applicator comprises a metal or ceramic applicator. 
     Alternatively or additionally the outer cap further comprises a stem having a second applicator thereon, the container further comprising a wiper adapted for placement within the inner cap, wherein the stem and second applicator are configured to pass through the wiper. 
     Alternatively or additionally to any of the examples above, in another example, engagement of the inner threads of the top cap with the outer threads of the outer side of the at least one upper sidewall may close the first end of the tubular sleeve. Alternatively or additionally to any of the examples above, in another example, the top cap may include a pintel which may be configured to engage with the aperture of the first applicator to seal the aperture when the inner threads of the top cap engage with the outer threads of the outer side of the at least one upper sidewall. 
     Another illustrative and non-limiting example takes the form of a method of manufacturing a cosmetic container comprising: starting with an extruded tube having a first end and a second end, attaching a first end structure to the first end of the extruded tube, the first end structure comprising a securing structure to attach to an upper cap and a dispenser having a passageway therethrough to dispense product from inside the extruded tube; and attaching an inner cap on the second end of the extruded tube. 
     Additionally or alternatively to the method example, the step of attaching the inner cap comprises insert molding the inner cap by passing a mandrel through the second end of the extruded tube and into the extruded tube to support the tube during insert molding of the inner cap. 
     Additionally or alternatively to the method example, the inner cap is a separately formed piece, and the step of attaching the inner cap on the second end of the extruded tube comprises at least one of welding, applying adhesive, or mechanical fixation. 
     Additionally or alternatively to the method example, the step of attaching the first end structure comprises insert molding the first end structure on the first end of the extruded tube, wherein: to insert mold the first end structure, a mandrel is placed through the second end of the extruded tube before the inner cap is placed, and a collapsible mandrel or a multi-part mandrel is placed through the second end of the tube and the tube is crimped onto the collapsible or multi-part mandrel for insert molding the inner cap to thereby attach the inner cap to the extruded tube. 
     Additionally or alternatively to the method example, the step of attaching the first end structure comprises insert molding the first end structure on the first end of the extruded tube, wherein: the inner cap is insert molded onto the second end of the extruded tube, thereby attaching the inner cap to the extruded tube, by advancing a mandrel through the first end of the extruded tube before the first end structure is attached; and to insert mold the first end structure, a collapsible or multi-part mandrel is placed through the inner cap and second end of the extruded tube after the inner cap is placed and the tube is crimped onto the collapsible or multipart mandrel for insert molding the first end structure. 
     Additionally or alternatively to the method example, the dispenser comprises an exterior having at least one tab, slot or indentation for securing to an applicator adapted for securing to the dispenser using the at least one tab, slot or indentation, the method further comprising securing the applicator onto the receiver. 
     The above summary of some example embodiments is not intended to describe each disclosed embodiment or every implementation of the present disclosure. The Figures, and Detailed Description, which follow, more particularly exemplify these embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing and other aspects of the present invention are best understood from the following detailed description when read in connection with the accompanying drawings. For the purpose of illustrating the invention, there is shown in the drawings, embodiments that are presently preferred, it being understood, however, that the invention is not limited to the specific instrumentalities disclosed. Included in the drawings are the following Figures: 
         FIG.  1    is a top perspective view of an illustrative cosmetic container; 
         FIG.  2    is an exploded view of the illustrative cosmetic container of  FIG.  1   ; 
         FIG.  3    is a cross-section view of an illustrative tubular sleeve as in  FIG.  2   , taken at lines  3 - 3 ; 
         FIG.  4    is a cross-section view of an illustrative cap assembly as in  FIG.  2   , taken at lines  4 - 4 ; 
         FIG.  5 A  is a cross-section view of the illustrative cosmetic container as in  FIG.  1   , taken at lines  5 - 5 , with the cap and O-ring removed; 
         FIG.  5 B  is a cross-section view of the illustrative cosmetic container as in  FIG.  1   , taken at lines  5 - 5 , with the cap removed; 
         FIG.  5 C  is a cross-section view of the illustrative cosmetic container as in  FIG.  1   , taken at lines  5 - 5 ; 
         FIG.  6    is a perspective view of an illustrative cosmetic container; 
         FIG.  7    is an exploded view of the illustrative cosmetic container of  FIG.  6   ; 
         FIG.  8    is a cross-section view of an illustrative tubular sleeve as in  FIG.  7   , taken at lines  8 - 8 ; 
         FIG.  9    is a cross-section view of an illustrative cap assembly as in  FIG.  7   , taken at lines  9 - 9 ; 
         FIG.  10 A  is a cross-section view of the illustrative cosmetic container as in  FIG.  6   , taken at lines  10 - 10 , with the cap removed; 
         FIG.  10 B  is a cross-section view of the illustrative cosmetic container as in  FIG.  6   , taken at lines  10 - 10 ; 
         FIG.  11    is a perspective view of an illustrative cosmetic container; 
         FIG.  12    is an exploded view of the illustrative cosmetic container of  FIG.  11   ; 
         FIG.  13    is a cross-section view of an illustrative tubular sleeve as in  FIG.  12   , taken at lines  13 - 13 ; 
         FIG.  14    is a cross-section view of an illustrative cap assembly as in  FIG.  12   , taken at lines  14 - 14 ; 
         FIG.  15 A  is a cross-section view of the illustrative cosmetic container as in  FIG.  11   , taken at lines  15 - 15 , with the cap removed; 
         FIG.  15 B  is a cross-section view of the illustrative cosmetic container as in  FIG.  11   , taken at lines  15 - 15 ; 
         FIG.  16    is a perspective view of an illustrative cosmetic container; 
         FIG.  17    is a perspective view of the illustrative cosmetic container of  FIG.  16   , with a top cap removed; 
         FIG.  18    is an exploded view of the illustrative cosmetic container of  FIG.  16   ; 
         FIG.  19    is a cross-section view of the illustrative cosmetic container as in  FIG.  16   , taken at lines  19 - 19 ; 
         FIG.  20    is a cross-section view of an illustrative cosmetic container for an alternative design, wherein an external view would look similar to  FIG.  16    and the section is taken along lines  19 - 19 . 
     
    
    
     DETAILED DESCRIPTION 
     The following description should be read with reference to the drawings wherein like reference numerals indicate like elements throughout the several views. The description and drawings show several embodiments which are meant to be illustrative in nature. 
     For convenience, the present disclosure may be described using relative terms including, for example, left, right, top, bottom, front, back, upper, lower, up, and down, as well as others. It is to be understood that these terms are merely used for illustrative purposes and are not meant to be limiting in any manner. 
       FIG.  1    illustrates a top perspective view of an illustrative cosmetic container  100 . As shown in  FIG.  1   , the cosmetic container  100  may include a tubular sleeve  110 , and a cap assembly  120 . The sleeve  110  may define a cavity  119 , and may include a first end  111  and a second end  131 . The first end  111  may include a first opening  114  which may be defined by at least one upper sidewall  113 . The upper sidewall  113  may include an inner side  115  and an outer side  116 , and the outer side  116  may include outer threads  112 . In some embodiments, the first opening  114  defined by the at least one upper sidewall  113  may be configured to engage with a nozzle, a cap, a brush, a sponge, an applicator, or the like, as shown in  FIGS.  17 - 20   , but this is not necessary. Rather than outer threads  112 , a circumferential set of tabs or a ring may be provided to allow for snap-on or twist on attachment of an applicator and/or sealing cap (not shown). 
     The sleeve  110  may further include a second opening  134  at the second end  131  of the sleeve  110 , as shown in  FIG.  2   . The cap assembly  120  may include a cap ring  122  and a cap  126 . The cosmetic container  100  may include the tubular sleeve  110  having a cylindrical shape and the cap assembly  120  having a circular shape, as shown in  FIGS.  1 - 5 B . Alternatively, the cosmetic container  100  may have a shape that is square, rectangular, triangular, oval, or any other desired shape. 
       FIG.  2    illustrates an exploded view of the illustrative cosmetic container  100 . As shown in  FIG.  2   , the cosmetic container  100  may include the sleeve  110  defining the cavity  119  for receiving a cosmetic product such as, liquids, creams, gels, and various makeup or skincare products such as foundation, concealer, lotion serum, petroleum products, sunscreen, moisturizer, etc. The cosmetic container  100  may further include the cap assembly  120  which may include the cap ring  122  and the cap  126 . The cap ring  122  may include an inner side  121  and an outer side  123 . The outer side  123  of the cap ring  122  may further include an annular ridge  135 , outer threads  124  for coupling the cap ring  122  to the cap  126 , and a channel  136  positioned between the annular ridge  135  and the outer threads  124 . The cap ring  122  may be adapted for placement and/or attachment at or adjacent the second end  131  of the sleeve  110  (as shown further in  FIGS.  5 A- 5 C ). The cap ring  122  may be attached to the sleeve  110  via friction fit, and/or may be attached or further secured using heat, laser, or sonic welding, injection molding, adhesive, or any other suitable method of attachment. 
     The cap  126  may include a bottom  127 , an optional inner wall  128 , and an outer wall  129 . The outer wall  129  may include inner threads  130 . The inner threads  130  may be configured to engage with the outer threads  124  of the cap ring  122  for coupling the cap  126  to the cap ring  122  so as to seal a second opening  134  of the second end  131  of the sleeve  110 . Alternatively, the cap  126  may not include inner threads  130  and the cap ring  122  may not include outer threads  124 , and instead snap fit or interference fit may be used in place of the threaded coupling. 
     The cap ring  122  and the cap  126  assemblies may have a substantially round (e.g., cylindrical) shape in which the seal may be provided by a thread fastening mechanism, as shown in  FIGS.  2 ,  4  and  5 C . However, it is contemplated that the cap ring  122  and the cap  126  may have an alternative shape (e.g., square, rectangular, oval, triangular, or any other shape desired) and may be sealed by a magnetic fastening mechanism, a snap fastening mechanism (e.g., a snap fit) or a clamp fastening system. It may be further contemplated that the cap ring  122  and the cap  126  have one shape, such as a square, and inner pieces have a second, substantially round shape, wherein closure may be provided by a thread, snap, or other suitable fastening mechanism. 
     The cap assembly  120  may include an O-ring  125 , which may be configured to fit around the outer side  123  of the cap ring  122  in the channel  136  positioned between the annular ridge  135  and the outer threads  124 . The O-ring  125  may have a thickness that is greater than a width between the outer wall  129  of the cap  126  and the channel  136  of the cap ring  122 . In this manner, when fastened together (e.g., placement of the cap  126  over the cap ring  122 ), the cap assembly  120  can compress the O-ring  125  interposed by the cap ring  122  and the cap  126 , thereby creating a seal. 
       FIG.  3    illustrates a cross-section view of the illustrative tubular sleeve  110  as in  FIG.  2   , taken at lines  3 - 3 . As discussed with reference to  FIGS.  1  and  2   , the sleeve  110  may define the cavity  119  for receiving a cosmetic product. The sleeve  110  may include the first end  111  which may include the first opening  114  defined by the at least one upper sidewall  113 . The upper sidewall  113  may include the inner side  115  and the outer side  116 , and the outer side  116  may include the outer threads  112 . The first end  111  may be formed by injection molding the first end  111  onto the sleeve  110 . The sleeve  110  may further include the second end  131  which may include the second opening  134 . The second opening  134  may allow access to the cavity  119  within the sleeve  110 , thereby allowing the cavity  119  of the sleeve  110  to be filled with a cosmetic product. In some embodiments, the second opening  134  may have a cylindrical shape, as illustrated in  FIGS.  1 - 5 C , which may be configured to engage with the cap assembly  120 , as shown further in  FIGS.  5 A- 5 C . It is contemplated that the second opening  134  may have any other suitable shape (e.g., conical, frustoconical, cylindrical, oval, or the like). 
     As shown in  FIG.  3   , the first end  111  of the sleeve  110  may include a lower end  117  and an opening  118  within the lower end  117 . The lower end  117  may provide a barrier between a cosmetic product contained within the sleeve  110  and the first opening  114  of the sleeve  110 . The opening  118  may be provided in the lower end  117  to allow access to the cosmetic product after the sleeve  110  has been sealed. The lower end  117  and the opening  118  together may prevent unintentional spillage of the cosmetic product and/or may prevent a user from acquiring more cosmetic product than intended. In some embodiments, the opening  118  may be a hole provided at a center of the lower end  117 , as illustrated in  FIG.  3   . In other embodiments, the opening  118  may include two or more holes. In some embodiments, the lower end  117  and the opening  118  may not be included. These are just some examples. 
       FIG.  4    illustrates a cross-section view of the illustrative cap assembly  120  as in  FIG.  2   , taken at lines  4 - 4 . As discussed with reference to  FIGS.  1  and  2   , the cap assembly  120  may include the cap ring  122  and the cap  126 . The cap ring  122  may include the inner side  121  and the outer side  123 . The outer side  123  of the cap ring  122  may further include the annular ridge  135  and the outer threads  124  for coupling the cap ring  122  to the cap  126 . The cap ring may further include the channel  136  positioned between the annular ridge  135  and the outer threads  124 . The channel  136  may be provided to receive the O-ring  125 . The cap ring  122  may be adapted for placement at or around the second end  131  of the sleeve  110  (as shown further in  FIGS.  5 A- 5 C ). The cap ring  122  may be attached to the sleeve  110  via heat-welding, injection molding, adhesion, or any other suitable method of attachment. 
     The cap  126  may include the bottom  127 , the inner wall  128 , and the outer wall  129 . The outer wall  129  may include the inner threads  130 . The inner threads  130  may be configured to engage with the outer threads  124  of the cap ring  122  for coupling the cap  126  to the cap ring  122  so as to seal the second opening  134  of the second end  131  of the sleeve  110 . Alternatively, the cap  126  may not include inner threads  130  and the cap ring  122  may not include outer threads  124 , and instead snap fit or interference fit may be used in place of the threaded coupling. In some examples the inner wall  128  may be omitted, as an adequate seal may be had by attachment of the cap ring  122  to the tubular sleeve and subsequent attachment of the cap  126  to the cap ring, with or without the aid of the O-ring  125 . 
     The cap ring  122  and the cap  126  assemblies (e.g., cap assembly  120 ) may have a substantially round (e.g., cylindrical) shape in which the seal may be provided by a thread fastening mechanism, as shown in  FIGS.  2 ,  4  and  5 C . However, it is contemplated that the cap ring  122  and the cap  126  may have an alternative shape (e.g., square, rectangular, oval, triangular, or any other shape desired) and may be sealed by a magnetic fastening mechanism, a snap fastening mechanism (e.g., a snap fit) or a clamp fastening system. It may be further contemplated that the cap ring  122  and the cap  126  have one shape, such as a square, and inner pieces have a second, substantially round shape, wherein closure may be provided by a thread fastening mechanism. 
       FIGS.  5 A- 5 C  illustrate cross-section views of the illustrative cosmetic container  100  as in  FIG.  1   , taken at lines  5 - 5 .  FIG.  5 A  shows the cosmetic container  100  with the cap  126  and the O-ring  125  removed. As shown, the cap ring  122  may be adapted for placement at or around the second end  131  of the sleeve  110 . The cap ring  122  may include a lip  137  located on the inner side  121  of the cap ring. The lip  137  may interact with the second opening  134  of the sleeve  110  and serve as a stop for the cap ring  122 . In this manner, when the cap ring  122  is placed over the second end  131  of the sleeve  110 , the lip  137  abuts the second end  131  of the sleeve  110  thereby preventing further advancement of the cap ring  122  over the sleeve  110 . The cap ring  122  may then be secured to the sleeve  110  via heat-welding, injection molding, adhesion, or any other suitable method of attachment. The O-ring  125  (when included) may then be placed around the cap ring  122  in the channel  136 , as shown in  FIG.  5 B . 
     As shown in  FIG.  5 C , the cap  126  may be coupled to the cap ring  122 . The inner threads  130  of the cap  126  engage with the outer threads  124  of the cap ring  122  such that the cap  126  may be threaded on to the cap ring  122 . The inner wall  128  of the cap  126  is optional. When included, the inner wall  128  may be adapted for placement within the second opening  134  of the sleeve  110 . The inner wall  128  of the cap  126  may be utilized as an alignment when placing the cap  126  over the cap ring  122 . 
     The outer wall  129  of the cap  126  may be adapted for placement around the cap ring  122 . The inner wall  128  and the outer wall  129  may be connected via the bottom  127  of the cap  126 . When the cap  126  is threaded on to the cap ring  122 , the bottom  127  effectively closes the second opening  134  of the sleeve  110 . When the O-ring  125  is included, the O-ring  125 , which may have a thickness that is greater than the width between the outer wall  129  of the cap  126  and the channel  136  of the cap ring  122 , may be compressed between the outer side  123  of the cap ring  122  and the outer wall  129  of the cap  126 , thereby creating a seal. 
       FIG.  6    illustrates a perspective view of an illustrative cosmetic container  200 . As shown in  FIG.  6   , the cosmetic container  200  may include a tubular sleeve  210 , and a cap assembly  220 . The sleeve  210  may define a cavity  219 , and may include a first end  211  and a second end  231 . The first end  211  may include a first opening  214  which may be defined by at least one upper sidewall  213 . The sleeve  210  may further include a second opening  234  at the second end  231  of the sleeve  210 , as shown in  FIG.  7   . The upper sidewall  213  may include an inner side  215  and an outer side  216 , and the outer side  216  may include outer threads  212 . Again, other connective structures aside from outer threads  212  may be used. 
     In some embodiments, the first opening  214  defined by the at least one upper sidewall  213  may be configured to engage with a nozzle, a cap, a brush, a sponge, an applicator, or the like, but this is not necessary. The cap assembly  220  may include an inner plug  222  and an outer cap  226 . The cosmetic container  200  may include the tubular sleeve  210  having a cylindrical shape and the cap assembly  220  having a circular shape, as shown in  FIGS.  6 - 10 B . Alternatively, the cosmetic container  200  may have a shape that is circular, square, rectangular, triangular, oval, or any other desired shape. 
       FIG.  7    illustrates an exploded view of the illustrative cosmetic container  200 . As shown in  FIG.  7   , the cosmetic container  200  may include the sleeve  210  defining the cavity  219  for receiving a cosmetic product such as, liquids, creams, gels, and various makeup products such as foundation, concealer, lotion serum, petroleum products, sunscreen, etc. The cosmetic container  200  may further include the cap assembly  220  which may include the inner plug  222  and the outer cap  226 . The inner plug  222  may include sidewalls  221 , an upper end  223 , and a lower end  224 . The lower end  224  may further include an outer ridge  225 , and the sidewalls  221  may include a groove  235 . The upper end  223  of the inner plug  222  may be a closed end, as illustrated in  FIG.  7   . The inner plug  222  may be adapted for placement within the second opening  234  of the sleeve  210 . The outer ridge  225  may serve as a stop for the inner plug  222 , as discussed further in reference to  FIG.  10 A . 
     The outer cap  226  may include a bottom  227 , an optional inner wall  228 , and an outer wall  229 . If included, the inner wall  228  of the outer cap  226  may be positioned within the inner plug  222 . The outer wall  229  of the outer cap  226  may be configured to be positioned around the second end  231  of the sleeve  210 , as will be discussed further with reference to  FIGS.  9  and  10 B . 
     The inner plug  222  and the outer cap  226  assemblies (e.g., cap assembly  220 ) may have a substantially round (e.g., cylindrical) shape in which the seal may be provided by a friction fit, as shown in  FIGS.  7 ,  10 A and  10 B . However, it is contemplated that the inner plug  222  and the outer cap  226  may have an alternative shape (e.g., square, rectangular, oval, triangular, or any other shape desired) and may be sealed by a magnetic fastening mechanism, a snap fastening mechanism (e.g., a snap fit) or a clamp fastening system. It may be further contemplated that the inner plug  222  and the outer cap  226  have one shape, such as a square, and inner pieces have a second, substantially round shape, wherein closure may be provided by a thread fastening mechanism. 
     The cap assembly  220  may include an O-ring  233 , which may be configured to fit around the sidewalls  221  of the inner plug  222  in the groove  235  positioned within the sidewalls  221 . The O-ring  233  may have a thickness that is greater than a width of inner plug  222 , when placed in the groove  235 . In this manner, when the inner plug  222  is placed within the second end  231  of the sleeve  210 , the inner plug  222  and the sleeve  210  can compress the O-ring  233  interposed by the inner plug  222  and the sleeve  210  to achieve an airtight seal. Other examples may not include an O-ring and may not be airtight and may simply serve to effectively contain and prevent spillage of the cosmetic product therein. 
       FIG.  8    illustrates a cross-section view of the illustrative tubular sleeve  210  as in  FIG.  7   , taken at lines  8 - 8 . As discussed with reference to  FIGS.  6  and  7   , the sleeve  210  may define the cavity  219  for receiving a cosmetic product. The sleeve  210  may include the first end  211  which may include the first opening  214  defined by the at least one upper sidewall  213 . The upper sidewall  213  may include the inner side  215  and the outer side  216 , and the outer side  216  may include the outer threads  212 . The first end  211  may be formed by injection molding the first end  211  onto the sleeve  210 . The sleeve  210  may further include the second end  231  which may include the second opening  234 . The second opening  234  may allow access to the cavity  219  within the sleeve  210 , thereby allowing the cavity  219  of the sleeve  210  to be filled with a cosmetic product. In some embodiments, the second opening  234  may have a cylindrical shape, as illustrated in  FIGS.  6 - 10 B , which may be configured to engage with the cap assembly  220 , as shown further in  FIGS.  10 A- 10 B . It may be contemplated that the second opening  234  may have any other suitable shape (e.g., conical, frustoconical, cylindrical, oval, or the like). 
     As shown in  FIG.  8   , the first end  211  of the sleeve  210  may include a lower end  217  and an opening  218  within the lower end  217 . The lower end  217  may provide a barrier between a cosmetic product contained within the sleeve  210  and the first opening  214  of the sleeve  210 . The opening  218  may be provided in the lower end  217  to allow access to the cosmetic product after the sleeve  210  has been sealed. The lower end  217  and the opening  218  together may prevent unintentional spillage of the cosmetic product and/or may prevent a user from acquiring more cosmetic product than intended. In some embodiments, the opening  218  may be a hole provided at a center of the lower end  217 , as illustrated in  FIG.  8   . In other embodiments, the opening  218  may include two or more holes. In some embodiments, the lower end  217  and the opening  218  may not be included. These are just some examples. 
       FIG.  9    illustrates a cross-section view of the illustrative cap assembly  220  as in  FIG.  7   , taken at lines  9 - 9 . As discussed with reference to  FIGS.  6  and  7   , the cap assembly  220  may include the inner plug  222  and the outer cap  226 . The inner plug  222  may include the sidewalls  221 , the upper end  223 , and the lower end  224 . The lower end  224  may further include the outer ridge  225 , and the sidewalls  221  may include the groove  235 . The O-ring  233  may be configured to fit around the sidewalls  221  of the inner plug  222  and fit within the groove  235 . The upper end  223  of the inner plug  222  may be a closed end, as illustrated in  FIG.  9   . The inner plug  222  may be adapted for placement within the second opening  234  of the sleeve  210 . The outer ridge  225  may serve as a stop for the inner plug  222 , as discussed further with reference to  FIGS.  10 A and  10 B . 
     The outer cap  226  may include the bottom  227 , the optional inner wall  228 , and the outer wall  229 . The inner wall  228  of the outer cap  226  may be positioned within the inner plug  222 , and the outer wall  229  of the outer cap  226  may be configured to be positioned around the second end  231  of the sleeve  210 . The inner wall  228  of the outer cap  226  may be configured to fit within the inner plug  222  such that the inner wall  228  may abut the upper end  223  of the inner plug  222 . The inner wall  228  may be utilized as an alignment when placing the outer cap  226  over the second end  231  of the sleeve  210 . The outer wall  229  of the outer cap  226  may include a first inner ridge  230 , which may be configured to engage with the outer ridge  225  of the inner plug  222 , and a second inner ridge  236 . The first inner ridge  230  may be positioned below the second inner ridge  236  along an inside of the outer wall  229 . In some examples, the inner wall  228  is omitted, as sealing is provided by the inner plug  222  being secured to the sleeve  210 , and the outer wall  229  being secured to the inner plug. 
       FIGS.  10 A- 10 B  illustrate cross-section views of the illustrative cosmetic container  200  as in  FIG.  6   , taken at lines  10 - 10 .  FIG.  10 A  shows the cosmetic container  200  with the outer cap  226  removed. As discussed above with reference to  FIG.  9   , the inner plug  222  may be adapted for placement within the second opening  234  of the sleeve  210 . The O-ring  233  may be positioned within the groove  235  of the inner plug  222 , and the inner plug  222  may include a shape and size such that when the inner plug  222  including the O-ring  233  is positioned within the second opening  234  of the sleeve  210 , the inner plug  222  including the O-ring  233  may be held within the sleeve  210  via a friction fit. 
     The inner plug  222  may include the outer ridge  225  which may be configured to engage with the second opening  234  of the sleeve  210 . The outer ridge  225  may serve to provide a stop for the inner plug  222 , such that when the inner plug  222  is positioned within the second opening  234  of the sleeve  210 , the outer ridge  225  abuts the second end  231  of the sleeve  210 , thereby preventing further advancement of the inner plug  222  within the cavity  219  of the sleeve  210 . 
     As shown in  FIG.  10 B , the outer cap  226  may be configured to engage with the inner plug  222 , thereby sealing the second opening  234  of the sleeve  210 . As discussed with reference to  FIG.  9   , the inner wall  228  of the outer cap  226  may be positioned within the inner plug  222 , and the outer wall  229  of the outer cap  226  may be configured to be positioned around the second end  231  of the sleeve  210 . The inner wall  228  of the outer cap  226  may be configured to fit within the inner plug  222  such that the inner wall  228  may abut the upper end  223  of the inner plug  222 . The outer wall  229  of the outer cap  226  may include the first inner ridge  230 , which may be configured to engage with the outer ridge  225  of the inner plug  222 , and the second inner ridge  236 . In some cases, the inner wall  228  of the outer cap  226  may be omitted. 
     The first inner ridge  230  may be positioned below the second inner ridge  236  along the inside of the outer wall  229 , such that to place the outer cap  226  over the inner plug  222  and the sleeve  210 , the second inner ridge  236  may first pass over the outer ridge  225  of the inner plug  222 , via a force (e.g., push force). Using continued force, the first inner ridge  230  may then pass over the outer ridge  225 . The first inner ridge  230  may engage with the outer ridge  225  of the inner plug  222  in a snap-fit fashion, thereby effectively sealing the second opening  234  of the sleeve  210 . When the O-ring  233  is to included, the second inner ridge  236  may pass over the O-ring  233  before the first inner ridge  230  passes over the outer ridge  225  as the outer cap  226  is paced over the inner plug  222  and the second end  231  of the sleeve  210 . In this manner, the outer cap  226  is snapped on and secures the cap assembly  220  to the sleeve  210  by adding pressure around the perimeter of the sleeve  210 , thus providing a more secure “grip” between the inner plug  222 , the sleeve  210  and the outer cap  226 . 
       FIG.  11    illustrates a perspective view of an illustrative cosmetic container  300 . As shown in  FIG.  11   , the cosmetic container  300  may include a tubular sleeve  310 , and a cap assembly  320 . The sleeve  310  may define a cavity  319 , and may include a first end  311  and a second end  331 . The first end  311  may include a first opening  314  which may be defined by at least one upper sidewall  313 . The sleeve  310  may further include a second opening  334  at the second end  331  of the sleeve  310 , as shown in  FIG.  12   . The upper sidewall  313  may include an inner side  315  and an outer side  316 , and the outer side  316  may include outer threads  312 . In some embodiments, the first opening  314  defined by the at least one upper sidewall  313  may be configured to engage with a nozzle, a cap, a brush, a sponge, an applicator, or the like, as shown in  FIGS.  17 - 19   , but this is not necessary. The cap assembly  320  may include an inner cap  322  and an outer cap  326 . The cosmetic container  300  may include the tubular sleeve  310  having a cylindrical shape and the cap assembly  320  having a circular shape, as shown in  FIGS.  12 - 15 B . Alternatively, the cosmetic container  300  may have a shape that is circular, square, rectangular, triangular, oval, or any other desired shape. 
       FIG.  12    illustrates an exploded view of the illustrative cosmetic container  300 . As shown in  FIG.  12   , the cosmetic container  300  may include the sleeve  310  defining the cavity  319  for receiving a cosmetic product such as, liquids, creams, gels, and various makeup products such as foundation, concealer, lotion serum, petroleum products, sunscreen, etc. The cosmetic container  300  may further include the cap assembly  320  which may include the inner cap  322  and the outer cap  326 . The inner cap  322  may include an inner wall  321  and an outer wall  323 . The outer wall may include an upper ridge  325 , and a tab  327  for coupling the inner cap  322  to the outer cap  326 . The inner cap  322  may be adapted for placement at or around the second end  331  of the sleeve  310  (as shown further in  FIGS.  15 A- 15 B ). The inner cap  322  may be attached to the sleeve  310  via heat-welding, injection molding, adhesion, or any other suitable method of attachment. 
     The outer cap  326  may include a bottom  329 , an inner wall  330 , and an outer wall  332 . The outer wall  332  may include an inner slot  333 . The inner slot  333  may be configured to engage with the tab  327  of the inner cap  322  for coupling the outer cap  326  to the inner cap  322  so as to provide a snap-fit between the outer cap  326  and the inner cap  322  and seal the second opening  334  of the second end  331  of the sleeve  310 . Alternatively, the outer cap  326  may include inner threads and the inner cap may include outer threads, and instead of a snap fit or interference fit, threaded coupling may be used. In some cases, the cap assembly  320  may include an O-ring (not shown), which may be configured to be placed around the outer wall  323  of the inner cap  322 , such that when assembled, the inner cap  322  and the outer cap  326  can compress the O-ring interposed by the inner cap  322  and the outer cap  326  to achieve an airtight seal. 
     The outer cap  326  and the inner cap  322  assemblies (e.g., cap assembly  320 ) may have a substantially round (e.g., cylindrical) shape in which the seal may be provided by a snap fit mechanism, as shown in  FIGS.  12 ,  15 A and  15 B . However, it is contemplated that the outer cap  326  and the inner cap  322  may have an alternative shape (e.g., square, rectangular, oval, triangular, or any other shape desired) and may be sealed by a magnetic fastening mechanism or a clamp fastening system. It may be further contemplated that the outer cap  326  and the inner cap  322  have one shape, such as a square, and inner pieces have a second, substantially round shape, wherein closure may be provided by a thread fastening mechanism. 
       FIG.  13    illustrates a cross-section view of the illustrative tubular sleeve  210  as in  FIG.  12   , taken at lines  13 - 13 . As discussed with reference to  FIGS.  11  and  12   , the sleeve  310  may define the cavity  319  for receiving a cosmetic product. The sleeve  310  may include the first end  311  which may include the first opening  314  defined by the at least one upper sidewall  313 . The upper sidewall  313  may include the inner side  315  and the outer side  316 , and the outer side  316  may include the outer threads  312 . The first end  311  may be formed by injection molding the first end  311  onto the sleeve  310 . The sleeve  310  may further include the second end  331  which may include the second opening  334 . The second opening  334  may allow access to the cavity  319  within the sleeve  310 , thereby allowing the cavity  319  of the sleeve  310  to be filled with a cosmetic product. In some embodiments, the second opening  334  may have a cylindrical shape, as illustrated in  FIGS.  11 - 15 B , which may be configured to engage with the cap assembly  320 , as shown further in  FIGS.  15 A- 15 B . It may be contemplated that the second opening  334  may have any other suitable shape (e.g., conical, frustoconical, cylindrical, oval, or the like). 
     As shown in  FIG.  13   , the first end  311  of the sleeve  310  may include a lower end  317  and an opening  318  within the lower end  317 . The lower end  317  may provide a barrier between a cosmetic product contained within the sleeve  310  and the first opening  314  of the sleeve  310 . The opening  318  may be provided in the lower end  317  to allow access to the cosmetic product after the sleeve  310  has been sealed. The lower end  317  and the opening  318  together may prevent unintentional spillage of the cosmetic product and/or may prevent a user from acquiring more cosmetic product than intended. In some embodiments, the opening  318  may be a hole provided at a center of the lower end  317 , as illustrated in  FIG.  13   . In other embodiments, the opening  318  may include two or more holes. In some embodiments, the lower end  317  and the opening  318  may not be included. These are just some examples. 
       FIG.  14    illustrates a cross-section view of the illustrative cap assembly  320  as in  FIG.  12   , taken at lines  14 - 14 . As discussed with reference to  FIGS.  11  and  12   , the cap assembly  320  may include the inner cap  322  and the outer cap  326 . The inner cap  322  may include the inner wall  321  and the outer wall  323 . The inner wall  321  and the outer wall  323  may be separated by a gap and may be joined together by a lower rim  324 . The inner wall  321  may be configured to extend into the cavity  319  of the sleeve  310  and the lower rim  324  may serve as a stop for the inner cap  322 , as shown further with reference to  FIGS.  15 A and  15 B . The inner wall  321  of the inner cap  322  may include the slot  328  on an inner side  315  of the inner wall  321 , which may be configured to engage with the outer cap  326 . The outer wall  323  of the inner cap  322  may include the tab  327  for coupling the inner cap  322  to the outer cap  326 , and the upper ridge  325 . The outer wall  323  may be configured to fit around sleeve  310  such that the sleeve  310  may be held between the inner wall  321  and the outer wall  323  of the inner cap  322 . 
     The outer cap  326  may include the bottom  329 , the inner wall  330 , and the outer wall  332 . The inner wall  330  of the outer cap  326  may be positioned within the inner wall  321  of the inner cap  322 , and the outer wall  332  of the outer cap  326  may be configured to be positioned around the outer wall  323  of the inner cap  322 . The inner wall  330  of the outer cap  326  may include an outer ridge  335 , which may be configured to fit within the slot  328  of the inner wall  321  of the inner cap  322 , in a snap fit fashion. The outer wall  332  of the outer cap  326  may include the inner slot  333 , which may be configured to engage with the tab  327  of the outer wall  323  of the inner cap  322 . In some examples, the inner wall  330  of the outer cap  326  may be omitted, and the engagement of the inner slot  333  and the tab  327  may connect the inner cap  322  and the outer cap  326  in a snap fit fashion. The upper ridge  325  of the inner cap  322  may have a width greater than the outer wall  323  of the inner cap  322 , such than when the outer cap  326  is placed over the inner cap  322  and snapped into place, the cap assembly  320  may have a flush appearance. 
       FIGS.  15 A- 15 B  illustrate cross-section views of the illustrative cosmetic container  300  as in  FIG.  11   , taken at lines  15 - 15 .  FIG.  15 A  shows the cosmetic container  300  with the outer cap  326  removed. As discussed above with reference to  FIG.  14   , the inner cap  322  may include the inner wall  321  and the outer wall  323 . The inner wall  321  and the outer wall  323  may be separated by a gap and may be joined together by the lower rim  324 . The inner wall  321  may be configured to extend into the cavity  319  of the sleeve  310 , and the lower rim  324  may serve as a stop for the inner cap  322 . The inner wall  321  of the inner cap  322  may include the slot  328  on the inner side  315  of the inner wall  321 , which may be configured to engage with the outer ridge  335  of the outer cap  326 . The outer wall  323  of the inner cap  322  may include the tab  327  for coupling the inner cap  322  to the outer cap  326 , and the upper ridge  325 . The outer wall  323  may be configured to fit around sleeve  310 , and the gap may be sized such that when the inner cap  322  is engaged with the sleeve  310 , the sleeve  310  may be held between the inner wall  321  and the outer wall  323  of the inner cap  322 . In some embodiments, the inner cap  322  may be attached to the sleeve  310  via heat-welding, injection molding, adhesion, or any other suitable method of attachment. 
     As shown in  FIG.  15 B , the outer cap  326  may be snap fit over the inner cap  322  so as to seal the second opening  334  of the sleeve  310 . As discussed above with reference to  FIG.  14   , the outer cap  326  may include the bottom  329 , the inner wall  330 , and the outer wall  332 . The bottom  329  of the outer cap  326  may form the bottom of the cosmetic container  300 . The inner wall  330  of the outer cap  326  may be positioned within the inner wall  321  of the inner cap  322 . When a force is applied (e.g., a push force) the outer ridge  335  of the inner wall  330  of the outer cap  326  may “snap into” the slot  328  of the inner cap  322 . In some cases, the inner wall  33   
     The outer wall  332  of the outer cap  326  may be configured to be positioned around the outer wall  323  of the inner cap  322 . The outer wall  332  of the outer cap  326  may include the inner slot  333 , which may be configured to engage with the tab  327  of the outer wall  323  of the inner cap  322 . When the force is applied, the tab  327  of the outer wall  323  of the inner cap  322  may “snap into” the inner slot  333  of the outer cap  326  while simultaneously, the outer ridge  335  of the inner wall  330  of the outer cap  326  may “snap into” the slot  328  of the inner cap  322 . The upper ridge  325  of the inner cap  322  may have a width greater than the outer wall  323  of the inner cap  322 , such than when the outer cap  326  is placed over the inner cap  322  and snapped into place, the cap assembly  320  may have a flush appearance. Alternatively, in other embodiments, the outer cap  326  may include inner threads and the inner cap  322  may include outer threads, and instead of a snap fit or interference fit, threaded coupling may be used. 
       FIG.  16    is a perspective view of an illustrative cosmetic container  400 . As shown in  FIG.  16   , the cosmetic container  400  may include a top cap  432 , a tubular sleeve  410 , and a cap assembly  420 . The sleeve  410  may have a cylindrical shape and the cap assembly  420  having a circular shape, as shown in  FIGS.  16 - 19   . Alternatively, the cosmetic container  400  may have a shape that is circular, square, rectangular, triangular, oval, or any other desired shape. The sleeve  410  may define a cavity  419  (as shown in  FIG.  19   ), and may include a first end  411  and a second end  431 . The first end  411  may include a first opening  414  which may be defined by at least one upper sidewall  413 . The sleeve  410  may further include a second opening  434  at the second end  431  of the sleeve  410 , as shown in  FIGS.  18 - 19   . The sleeve  410  may be formed from a soft or flexible material (e.g., polypropylene, polyethylene, etc.) which may have a thickness of about 0.1 mm to about 2.0 mm, such that a user may squeeze the sleeve  410  to dispense a cosmetic product contained within the sleeve  410  through the first end  411  and/or an applicator (e.g., first applicator  435 ). In another example, the thickness may be about 0.1 mm to about 1 mm. In another example, the thickness may be about 0.1 mm to about 0.7 mm. The assembly, when completed, may be used to create an airtight or hermetic seal. In some examples the sleeve  410  is a piece of extruded tube. 
       FIG.  17    is a perspective view of the illustrative cosmetic container  400  of  FIG.  16   , with the top cap  432  removed. As shown in  FIG.  17   , the upper sidewall  413  may include an outer side  416 , and the outer side  416  may include outer threads  412 . In some embodiments, as seen in  FIG.  17   , the first opening  414  (as shown in  FIG.  19   ) defined by a dispenser and at least one upper sidewall  413  which are configured to engage with a first applicator  435 . In some examples, the first applicator  435  may include an aperture  442  through which a cosmetic product contained within the sleeve  410  may pass. In other examples, the first applicator  435  may be a brush, a doefoot, a sponge, or an applicator for applying liquid eyeliner or a lip gloss contained within the sleeve  410 . In some examples, the first applicator  435  may be formed from metal or ceramic, which may provide a cooling effect when used to apply the product contained within the sleeve  410 . In some examples, the cosmetic container  400  may include a pump structure and/or an airless pump structure (not shown) including, for example, a valve and piston. These are just examples. 
       FIG.  18    is an exploded view of the illustrative cosmetic container  400  of  FIG.  16   . As shown in  FIG.  18   , the cosmetic container  400  may include the sleeve  410  having the first end  411  and the second end  431 . The first end  411  of the sleeve  410  may include the first opening  414  which may be defined by the at least one upper sidewall  413  that forms part of a receiving structure or dispenser  439  that is configured to engage with the first applicator  435 . The dispenser  439  may include a tab  441  (as shown in  FIG.  19   ), such that the first applicator  435  may snap on to the dispenser  439 . Rather than a tab, a slot indentation, ring, or threading may be provided to secure the first applicator  435 . 
     The outer side  416  of the upper sidewall  413  may include outer threads  412 . The outer threads  412  may be configured to engage with inner threads  433  of the top cap  432 . The top cap  432  may be placed over the first applicator  435 , thereby aligning the inner threads  433  with the outer threads  412 . Engagement of the outer threads  412  and the inner threads  433  may serve to close the first end  411  of the sleeve  410  (e.g., close the cosmetic container  400 ). Alternatively, the top cap  432  may not include inner threads  433  and the outer side  416  of the upper sidewall  413  may not include outer threads  412 , and instead snap fit or interference fit may be used in place of the threaded coupling. 
     The cosmetic container  400  may further include the cap assembly  420  which may include an inner cap  422  and an outer cap  426  at the second end  431  of the sleeve  410 . The inner cap  422  may include an outer side may include outer threads  424 . The inner cap  422  may be adapted for placement at or adjacent the second end  431  of the sleeve  410  (as shown further in  FIG.  19   ). The inner cap  422  may be attached to the sleeve  410  via welding, injection molding, adhesion, mechanical fixation, and/or any other suitable method of attachment. When assembled, the inner cap  422  may be secured to the sleeve  410  such that the inner cap  422  may not rotate relative to the sleeve  410 . 
     The outer cap  426  may include a bottom  457 , an inner wall  446 , and an outer wall  443 . The outer wall  443  may include inner threads  430 . The inner threads  430  may be configured to engage with the outer threads  424  of the inner cap  422  for coupling the outer cap  426  to the inner cap  422  so as to seal a second opening  434  of the second end  431  of the sleeve  410 . Alternatively, the outer cap  426  may not include inner threads  430  and the inner cap  422  may not include outer threads  424 , and instead snap fit or interference fit may be used in place of the threaded coupling. When assembled, the coupling of the outer cap  426  to the inner cap  422  may seal the second opening  434  of the second end  431  of the sleeve  410 . Alternatively or additionally, disengagement of the outer cap  426  from the inner cap  422  may allow access to the cavity  419  of the sleeve  410 , thereby allowing access to the cosmetic product contained within, and/or allow access to refill the sleeve  410  once the product contained within has been depleted. 
     The cap assembly  420  (e.g., the inner cap  422  and the outer cap  426 ) may have a substantially round (e.g., cylindrical) shape in which the seal may be provided by a thread fastening mechanism, as shown in  FIGS.  16 - 19   . However, it is contemplated that the inner cap  422  and the outer cap  426  may have an alternative shape (e.g., square, rectangular, oval, triangular, or any other shape desired) and may be sealed by a magnetic fastening mechanism, a snap fastening mechanism (e.g., a snap fit) or a clamp fastening system. It may be further contemplated that the inner cap  422  and the outer cap  426  have one shape, such as a square, and inner pieces have a second, substantially round shape, wherein closure may be provided by a thread, snap, or other suitable fastening mechanism. In some cases, the cap assembly  420  may include an O-ring (not shown), placed around the outer side of the inner cap  422 , or a gasket on an inner side of the outer cap  426 , such that when assembled, the inner cap  422  and the outer cap  426  can compress the O-ring or gasket to provide an airtight or hermetic seal. 
     As shown in  FIG.  18   , the outer cap  426  may include a stem  437 . The stem  437  may include a proximal end  447  and a distal end  448 . The distal end  448  may be adapted to receive an applicator (e.g., second applicator  449 , as shown in  FIG.  19   ). The stem  437  may be configured to extend into the cavity  419  of the sleeve  410 . When the stem  437  having an applicator is included, a user may rotate the outer cap  426  relative to the sleeve  410  and thereby the inner cap  422  to remove the outer cap  426  and the stem  437  from the sleeve  410 . In this manner, a user may use the stem  437  and the attached applicator to apply the product contained within the sleeve  410 . 
       FIG.  19    is a cross-section view of the illustrative cosmetic container  400  as in  FIG.  16   , taken at lines  19 - 19 . As shown in  FIG.  19   , the cosmetic container  400  may include the sleeve  410  defining the cavity  419  for receiving a cosmetic product such as, liquids, creams, gels, and various makeup products such as foundation, concealer, lotion serum, petroleum products, sunscreen, etc. The cosmetic container  400  may include the top cap  432 , which may include a pintel  438 . The pintel  438  may be adapted to fit within the aperture  442  of the first applicator  435  when the top cap  432  is threaded onto the cosmetic container  400 . The pintel  438  may serve to seal the aperture  442  of the first applicator  435  to prevent the product contained within the sleeve  410 . Such sealing action may occur relative to either the aperture  442  of the first applicator  435  and/or relative to the opening of the termination of the passageway through the dispenser  439 , as by abutting, entering, or partly entering the tip of the dispenser  439 . For example, in use, a user may flip the cosmetic container  400  “upside down” to remove the outer cap  426  and the stem  437  and apply a product. In this case, in order to prevent the product from inadvertently spilling out of the aperture  442 , the pintel  438  fits within the aperture  442  and prevents product by spilling out. 
     The first applicator  435  may be coupled to the dispenser  439 . The dispenser  439  may include the tab  441  configured to engage with the inner channel  444  of the first applicator  435  which prevents rotation of the first applicator  435  relative to the dispenser. An annular ridge or protrusion may also be seen level with the tab  441 , which serves to allow snap fit of the first applicator  435  onto the dispenser  439 . Other coupling mechanisms between the first applicator and the dispenser are  439  contemplated as well, such as threading, friction fit, slot-twist (an L-shaped slot with an indentation at the furthest extent thereof to receive and secure a corresponding protrusion), magnet, etc. While such reversible attachment is generally sufficient, irreversible attachment is also contemplated, including for example the use of an adhesive attachment. 
     As discussed, the cap assembly  420  may include the inner cap  422  and the outer cap  426 . The outer cap  426  may include the stem  437  which may include the second applicator  449 . The second applicator  449  may be a brush, a doefoot, a sponge, or an applicator for applying liquid eyeliner or a lip gloss (or other cosmetic product such as a cream, lotion, concealer, foundation, hair care product, eye gel, etc.) contained within the sleeve  410 . In some examples the second applicator may be a metal or ceramic capable of providing a cooling effect. The second applicator  449  may also be a dropper, in which case the outer cap may have a flexible portion or button to actuate the dropper. 
     The container  400  may further include a wiper  436 , as shown in  FIG.  19   . The wiper  436  may be adapted for placement within an inner side  450  of in the inner cap  422 . The wiper  436  may be held within the inner cap  422  via friction fit or any other suitable method of attachment. The wiper  436  may include an outer lip  440  which may engage with a bottom side of the inner cap  422 . The outer lip  440  of the wiper  436  may serve as a stop for the wiper  436 , thereby preventing the wiper  436  from advancing into the cavity  419  of the sleeve  410 . The stem  437  and the second applicator  449  of the outer cap  426  may be configured to pass through the wiper  436 . The wiper  436  may control the amount of product that may be removed from the sleeve  410 . For example, when the stem  437  and the second applicator  449  pass through the wiper  436 , excess cosmetic product may be removed from the second applicator  449 . While the cosmetic container  400  is depicted as including the wiper  436 , this is not necessary. In some examples, a removeable or non-removeable cap may be provided at the second end to couple to the inner cap  422 , rather than an applicator as shown in  FIGS.  18 - 19   . The applicator as shown in  FIGS.  18 - 19    may also be included in the examples of  FIGS.  1 - 15   , if desired, if the bottom cap of such examples is a removable piece (such as when applied using threading as in  FIGS.  1 - 5 C ). 
       FIG.  20    is a cross-section view of an alternative design which is in several respects similar to that of  FIG.  19   . An external perspective view could be as shown in  FIG.  16   , and the section would be along line  19 - 19  of  FIG.  16   . In this design, the second applicator is omitted. Thus, as shown in  FIG.  20   , the illustrative cosmetic container  500  includes a sleeve  510  defining a cavity  519  for receiving a cosmetic product such as, liquids, creams, gels, and various makeup products such as foundation, concealer, lotion serum, petroleum products, sunscreen, etc. The sleeve  510  may be an extruded piece. 
     A top cap  532  is shown covering an applicator  535  which is held in place over a dispenser  539 . The cap  532  has inner threads  533  that engage outer threads  512  on a sidewall of the first end  511  of the container. The inner applicator  539  and outer threads  512  may be formed by insert molding onto the sleeve  510 . 
     At the second end  531  of the sleeve  510  a lower cap assembly  520  is shown. The lower cap assembly includes an inner cap  522  having outer threads  524  thereon, which couple to an outer cap  526  having inner threads  530 . The outer cap  526  is thus used to seal the opening  534  of the sleeve at the second end  531  by screwing onto the inner cap  522 . A gasket or O-ring may be provided in the lower cap assembly  520  to enhance sealing, if desired. No wiper is needed at the second end  531  in this example because no second applicator is provided. In use, the second cap  526  may be removed to allow filling and/or refilling of the cosmetic container  500 . In another example, a non-removable cap is provided such as by using an aggressive one-way snap that allows the cap to be screwed on, but which makes it very difficult to screw the cap off. For example, threading on the surfaces may have a texture that allows for threading the cap on, but prevents threading the cap off. A threaded attachment may have a snap or protrusion at the end of one or the other, or both, sets of threads of an inner and outer thread combination, such that once fully threaded on, the snap prevents removal. In another example, a cap may be threaded on and over-turned, going beyond the end of threading extend causing damage to the threading and preventing removal. 
     The applicator  535  may be any suitable applicator, such as a thermal tip (ceramic or metal, for example, as described in U.S. Pat. Nos. 7,883,287, 9,498,042 and/or 9,538,824, the disclosures of which are incorporated herein by reference, a plastic or gel tip, or a brush, sponge, etc. Although not shown, a sealing O-ring or gasket may be included in cap  526 . 
     In the example of  FIG.  20   , as well as the preceding examples, rather than threading to secure the caps  532  and  526 , snap fit or interference fit may be used, if desired. 
     For each of  FIGS.  19  and  20   , for manufacturing purposes, either end of the sleeve  410 / 510  (also referred to as a tube) may be formed by molding additional material thereon. In an example, the structure added to the first end  411 / 511  may be formed by insert molding onto the sleeve, thereby adding material to form the outer threads  433 / 533  and associated upper sidewall, as well as the dispenser  439 / 539 , using a mandrel that is inserted through the second end  431 / 531  of the sleeve  410 / 510 . After insert molding the first end structure is complete and the mandrel is removed, a separately formed inner cap  422 / 522  may be attached to the second end  431 / 531  of the sleeve  410 / 510  by mechanical fixation, by sonic or heat welding, or via adhesive, or a combination thereof; heat shrinking may be used as well. For example, the pieces may be placed and held in position using mechanical fixation, with added fixation by applying heat or sonic welding. In another example, the pieces may be placed using adhesive and also mechanically fixed in place. Other combinations of fixation may be used. 
     In an alternative, the second end  431 / 531  structure may be formed by insert molding the inner cap  422 / 522  onto the sleeve  410 / 510  using a mandrel inserted through the first end  411 / 511  of the sleeve  410 / 510 . After the insert molding is complete and the mandrel is removed, a separately formed top piece comprising the threads  433 / 533  on the upper sidewall and dispenser  439 / 539  can be secured to the first end  411 / 511  of the sleeve  410 / 510  using mechanical fixation, sonic or heat welding, via adhesive, by heat shrinking, or by a combination thereof. In still another alternative, each of the top piece comprising the threads  533 / 533  on upper sidewall and the dispenser  439 / 539 , and the inner cap  422 / 522 , may be secured to the sleeve  410 / 510  using mechanical fixation, sonic or heat welding, via adhesive, by heat shrinking, or by a combination thereof. 
     It should be noted that the resulting structure is distinct from one construction method to the next. The use of sonic or heat welding causes a small amount of blending of the two materials of the pieces that are joined together along a relatively defined joint region. A challenge with any welding process, particularly with a larger area of weld joint such as a circumferential weld that traverses more than a few millimeters of longitudinal extent, is that the two materials will only blend and attach at locations where the weld energy is sufficient to cause both materials to reach a melting temperature. Adhesive does not blend the two materials at all and will leave a seam having a distinct material contained therein. Insert molding of compatible materials is likely the most secure of these attachment types. In particular, insert molding two pieces of identical materials or highly similar materials, or materials with similar melt temperatures, results in joining at the edges that avoids the appearance of a seam. A seam can be subject to lamination and separation making for an objectively different product if two pieces are heat or sonic welded together, rather than insert molded, and, if visible, subjectively reduces the visual attractiveness of the item. While some examples above use insert molding on one end of the tube and adhesive, welding and/or mechanical pressure on the other end of the tube, some examples make use of insert molding at both ends of the tube. 
     In the existing manufacturing processes, on which the present invention is an improvement, an insert mold process provides structure on one end of a tube, with the other end of the tube being crimped after filling, rather than having any sort of structure or cap. The construction using insert molding on each end is not a simple matter of “doing the same thing” on both ends of the tube, since the standard, cheap process of placing one insert molded piece on a tube is to insert a large mandrel from the other end of the tube, which can really only be done from one end of the tube; after a structure is inset molded on one end of the tube by standard processes, the identical process cannot be used on the other end of the tube since one end is at least partly blocked or reduced in available diameter. Additional steps, including crimping down onto a mandrel that is smaller than the tube, and/or using a collapsible or multi-part mandrel for molding, are needed. 
     For example, referring to the above examples, a standard process may be used to insert mold the second end structure first, and a multi-part mandrel having two or more sector-shaped (pie piece shapes) portions that are separately placed alongside one another within the tube for molding the first end structure, after passing through the relatively larger opening of the second end structure. After molding the first end structure, removing and/or disassembling one part of the multi-part mandrel at a time allows the mandrel to be removed easily. In another example, a standard process may be used to insert mold the first end structure, and a multi-part mandrel having two or more sector-shaped pieces is assembled inside the tube with access through the first end (depending on what has been placed on the first end of the tube) or second end of the tube in order to allow the second end to be insert molded onto the tube; crimping the tube onto the mandrel may be used in both steps. A multi-part mandrel may be used for both steps, by introduction through the second end and assembly near the first end, and then sliding within the tube to the second end for another molding step. 
     Rather than a multi-part mandrel, a radially expandable and collapsible mandrel may be used. For example, a mandrel having a support structure that outwardly extends a structure having partially circumferential, interleaving teeth may be used, in which the overlapping of teeth when fully extended provides support about the entire circumference while having small gaps sufficiently narrow to support the tube during insert molding. Moreover, crimping around the outside of the tube for purposes of insert molding allows pressure to be applied in the region of the mold. 
     In still another example, both ends of the sleeve  410 / 510  may be formed using insert molding processes. For example, the first end structure  411 / 511  may be added in a first step, with placement over a mandrel that extends through the sleeve  410 / 510  from the second end. Next, the second end structure  420 / 520  may be added to the sleeve by inserting a mandrel, which may be a collapsible mandrel or a multi-piece mandrel, in through the second end and adding material to form the inner cap  422 / 522  and threads  424 / 524 . As an alternative, the second end structure  420 / 520  may be formed first, and a mandrel inserted through the opening in the inner cap  422 / 522  to support the upper end of the sleeve  410 / 510 , wherein the mandrel may be a collapsible mandrel or it may be sized to fit through the opening in the inner cap  422 / 522  with the upper end of the sleeve  410 / 510  crimped onto the mandrel to a provide the step down in diameter that is apparent at  412 / 512 , with added material insert molded thereon to form the structures on the first end  411 / 511 . 
     The use of an extruded tube with elements added to each end is also an improvement over the use of standard molding to form the tube along with features at each end. For example, it is common to mold a tube having a first end with a receiving structure, such as threads, tabs, ring, etc. to which a dispenser and/or applicator are attached. Extrusions allow different materials, and different surface finishes to be achieved. 
     An example method of filling a cosmetic container (e.g., cosmetic containers  100 ,  200 ,  300 ,  400  and/or  500 ) may include forming a tubular sleeve. The tubular sleeve may define a cavity, and may include a first end with a first opening and a second end with a second opening. The first opening may be defined by at least one upper sidewall, which may have an inner side, an outer side, and a lower end. The outer side of the upper sidewall may include outer threads. The tubular sleeve may be formed in any suitable manner, such as by extrusion. The first end of the tubular sleeve may be formed by injection molding. After the first end is provided on the tubular sleeve, the tubular sleeve may be filled with product; in some example, a cap ring is first insert molded onto the second end of the tubular sleeve prior to filling. The cosmetic product may include, but are not limited to, liquids, creams, gels, and various makeup products such as foundation, concealer, lotion serum, petroleum products, sunscreen, etc. The cosmetic container may then be sealed via a cap assembly (e.g., cap assemblies  120 ,  220 ,  320 ,  420  and/or  520 ). 
     In some embodiments, the cosmetic containers  100 ,  200 ,  300 ,  400  and/or  500  and the various components thereof may be made from a flexible or semi-rigid material, such as plastic or aluminum. In some embodiments, the cosmetic containers  100 ,  200 ,  300 ,  400 ,  500  may comprise a transparent or translucent material so that the cosmetic product may be externally viewed, though in other examples, the tubular sleeve and other elements may be opaque. 
     The above description is intended to be illustrative, and not restrictive. For example, the above described examples (or one or more aspects thereof) and example method, may be used in combination with each other. Other embodiments can be used, such as by one of ordinary skill in the art upon reviewing the above description. 
     Although the invention has been described with reference to exemplary embodiments, it is not limited thereto. Those skilled in the art will appreciate that numerous changes and modifications may be made to the preferred embodiments of the invention and that such changes and modifications may be made without departing from the true spirit of the invention. It is therefore intended that the appended claims be construed to cover all such equivalent variations as fall within the true spirit and scope of the invention.