Patent Publication Number: US-7712962-B1

Title: Storage bag

Description:
FIELD OF THE INVENTION 
   The present invention relates to storage bags suitable for use in the containment and protection of various items, such as food items. The present invention further relates to processes for forming a material suitable for constructing a storage bag of the present invention. 
   BACKGROUND OF THE INVENTION 
   The use of storage bags for containing items to be stored, such as food items, is generally known in the art. Such storage bags include freezer bags provided in various sizes for containing food items, such as meats, in a sealed manner in a freezer environment. It is desirable for such bags to have a reclosable or reusable closure effective to provide an airtight seal. Further, in use of such storage bags, it is desirable to eliminate any air contained within the storage bag and seal opposing sides of the bag to prevent reentry of air in order to minimize contact of the bag contents with air and reduce the possibility of freezer burn, such as may occur as a result of dehydration of a food item stored in a low humidity, freezer environment. Similarly, for other items not stored in a freezer environment, it is beneficial for the preservation of the items to minimize air contact when stored within a storage bag. 
   There continues to be need for a storage bag suitable for use in containing stored items in a freezer or other environment, and in which an item may be sealably retained in the bag and air contact with the stored item may be minimized. 
   BRIEF SUMMARY OF THE INVENTION 
   The invention provides a storage bag having a first sidewall, a second sidewall, and a third sidewall. The first sidewall has a first interior surface and the second sidewall has a second interior surface. The first and second sidewalls are attached to one another along at least a portion of a periphery of the first and second sidewalls. The third sidewall has a third interior surface that is attached to at least one of the first and second interior surfaces. An adhesive is disposed on a portion of at least one of the first, second, and third interior surfaces. 
   The invention further provides a storage bag further comprising one or more perforations in at least one of the first sidewall and the second sidewall. 
   The invention further provides a storage bag having a film disposed over the adhesive, and the film having a plurality of perforations. 
   The invention further provides a storage bag having one or more perforations in the third sidewall. 
   The invention further provides a storage bag wherein the third sidewall has a line of tear perforations to permit at least a portion of the third sidewall to be separated from the at least one of the first and second interior surfaces by tearing along the line of tear perforations. 
   The invention further provides a storage bag comprising a fourth sidewall having a fourth interior surface. 
   The invention further provides a storage bag wherein the fourth sidewall is connected to the third sidewall, and the fourth sidewall is attached to one of the other first and second interior surfaces that is not directly connected to the third sidewall such that the third and fourth sidewall form an inner bag. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a front elevational view of a reclosable storage bag in accordance with the teachings of the present invention; 
       FIG. 2  is a cross-sectional elevational view taken along line  2 - 2  in  FIG. 1 ; 
       FIG. 3  is an enlarged view of a section taken at line  3 - 3  in  FIG. 2 , illustrating an inner layer of the storage bag of  FIG. 1 ; 
       FIG. 4  is an enlarged elevational section view of the inner layer illustrated in  FIG. 3 ; 
       FIG. 5  is a perspective view of the storage bag of  FIG. 1  containing an item sealed within the storage bag; 
       FIG. 6  is cross-sectional elevational view of an alternative configuration of the storage bag of  FIGS. 1 and 2 ; 
       FIG. 7  is a perspective view of the storage bag of  FIG. 6  containing an item sealed within the storage bag; 
       FIG. 8  is a front elevational view of an alternative embodiment of the reclosable storage bag in accordance with the teachings of the present invention; 
       FIG. 9  is a cross-sectional elevational view taken along line  9 - 9  in  FIG. 8 ; 
       FIG. 10  is a front elevational view of a further embodiment of the reclosable storage bag in accordance with the teachings of the present invention; 
       FIG. 11  is a cross-sectional elevational view taken along line  11 - 11  in  FIG. 10 ; and 
       FIG. 12  is a diagrammatic view illustrating a process for forming a storage bag material for the present invention. 
       FIG. 13  is a front elevational view of another embodiment of a storage bag. 
       FIG. 14  is a cross-sectional elevational view taken along line  14 - 14  in  FIG. 13 . 
       FIG. 15  is a fragmentary cross-sectional elevational view of the storage bag of  FIGS. 13 and 14 . 
       FIG. 16  is another fragmentary cross-sectional elevational view of the storage bag of  FIGS. 13 and 14 . 
       FIG. 17  is another fragmentary cross-sectional elevational view of the storage bag of  FIGS. 13 and 14 . 
       FIG. 18  is an exploded view of a sidewall for the storage bag of  FIGS. 13 and 14 . 
       FIG. 19  is a diagram illustrating a process for forming the sidewall of  FIG. 18 . 
       FIG. 20  is a diagram illustrating another process for forming the sidewall of  FIG. 18 . 
       FIG. 21  is a diagram illustrating another process for forming the sidewall of  FIG. 18 . 
       FIG. 22  is a diagram illustrating another process for forming the sidewall of  FIG. 18 . 
       FIG. 23  is a front elevational view of another embodiment of a storage bag. 
       FIG. 24  is a cross-sectional elevational view taken along line  24 - 24  in  FIG. 23 . 
       FIG. 25  is a fragmentary cross-sectional elevational view of the storage bag of  FIGS. 23 and 24 . 
       FIG. 26  is a front elevational view of another embodiment of a storage bag. 
       FIG. 27  is a cross-sectional elevational view taken along line  27 - 27  in  FIG. 26 . 
       FIG. 28  is a front elevational view of another embodiment of a storage bag. 
       FIG. 29  is a cross-sectional elevational view taken along line  29 - 29  in  FIG. 28 . 
       FIG. 30  is a front elevational view of another embodiment of a storage bag. 
       FIG. 31  is a cross-sectional elevational view taken along line  31 - 31  in  FIG. 30 . 
       FIG. 32  is a front elevational view of another embodiment of a storage bag. 
       FIG. 33  is a cross-sectional elevational view taken along line  33 - 33  in  FIG. 32 . 
       FIG. 34  is a front elevational view of another embodiment of a storage bag. 
       FIG. 35  is a cross-sectional elevational view taken along line  35 - 35  in  FIG. 34 . 
       FIG. 36  is a cross-sectional elevational view of another embodiment of a storage bag. 
       FIG. 37  is a cross-sectional elevational view of another embodiment of a storage bag. 
       FIG. 38  is a front elevational view of another embodiment of a storage bag. 
       FIG. 39  is a cross-sectional elevational view taken along line  39 - 39  of the storage bag of  FIG. 38 . 
       FIG. 40  is a front elevational view of another embodiment of a storage bag. 
       FIG. 41  is a cross-sectional elevational view taken along line  41 - 41  of the storage bag of  FIG. 40 . 
       FIG. 42  is a front elevational view of another embodiment of a storage bag. 
       FIG. 43  is a cross-sectional elevational view taken along line  43 - 43  of the storage bag of  FIG. 42 . 
       FIG. 44  is a front elevational view of another embodiment of a storage bag. 
       FIG. 45  is a cross-sectional elevational view taken along line  45 - 45  of the storage bag of  FIG. 44 . 
       FIG. 46  is a front elevational view of another embodiment of a storage bag. 
       FIG. 47  is a cross-sectional elevational view taken along line  47 - 47  of the storage bag of  FIG. 46 . 
       FIG. 48  is a fragmentary cross-sectional elevational view of the storage bag of  FIGS. 46 and 47 . 
       FIG. 49  is a front elevational view of another embodiment of a storage bag. 
       FIG. 50  is a cross-sectional elevational view taken along line  50 - 50  of the storage bag of  FIG. 49 . 
       FIG. 51  is a front elevational view of another embodiment of a storage bag. 
       FIG. 52  is a cross-sectional elevational view taken along line  52 - 52  of the storage bag of  FIG. 51 . 
       FIG. 53  is a fragmentary cross-sectional elevational view of the storage bag of  FIGS. 51 and 52 . 
       FIG. 54  is a cross-sectional elevational view of the storage bag of  FIGS. 28 and 29  with an object disposed within the inner bag. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring to  FIGS. 1 and 2 , a reclosable storage bag  10  in accordance with the teachings of the present invention is shown. The storage bag  10  generally includes two opposing sidewalls  12 ,  14  that are attached together along a portion of a periphery of the sidewalls  12 ,  14 , such as along longitudinal edge seams  16 ,  18  and along a laterally extending bottom edge  20 . In the illustrated storage bag  10 , the longitudinal edge seams  16 ,  18  may be formed by sonic welding, heat sealing, an adhesive or other conventional attachment means along the edges of the material forming the sidewalls  12 ,  14 , and the bottom edge  20  may be defined by a fold in the material forming the sidewalls  12 ,  14 . Further, the bottom edge  20  may also include an edge seam formed in a manner similar to that of the longitudinal edge seams  16 ,  18 . 
   An upper end of the bag  10  includes an open mouth  22  for insertion of articles into the interior of the bag  10 . A reusable closure  24  comprising complementary mating elements  26 ,  28  is located on the interior of the sidewalls  12 ,  14  at the mouth  22  for reclosably sealing the mouth  22  of the bag  10 . For example, the reusable closure may comprise an interlocking seal type closure, and which may or may not include a slider for manipulating opening and closing of the bag  10 . The present invention is not limited to the illustrated reusable closure, and examples of reusable closures that may be employed, and information on their manufacture, is described in U.S. Pat. Nos. 4,186,786; 4,285,105; 4,363,345; 4,561,109; 5,804,265 and 5,851,070. Other closures may also be provided within the scope of the described invention. 
   Referring to  FIG. 2 , each of the sidewalls  12 ,  14  forming the bag  10  comprise plural layers, including a first layer  30  and a second layer  32  for the sidewall  12  and a first layer  34  and a second layer  36  for the sidewall  14 . The first layers  30 ,  34  define an outer film surface for the bag  10 , and the second layers  32 ,  36  define an inner, article engaging film for the bag  10 . The second or inner layers  32 ,  36  comprise a composite material having a characteristic that enables inner facing surfaces  38 ,  40  of the inner layers  32 ,  36  to adhere to each other. Alternatively, one of the second layers  32 ,  36  may be omitted so that the remaining second layer will adhere to the opposing non-adhesive inside surface of the first layer. By way of example, the inner layers  32 ,  36  are formed of a pressure sensitive composite material  41  ( FIG. 3 ) exhibiting a characteristic of releasably adhering to an adjacent contacting material surface upon application of a pressure, while not adhering to the adjacent contacting surface in the absence of application of the pressure. 
   Such composite materials are known in the art and include films formed with a plurality of protrusions  42  and valleys  44  ( FIG. 4 ), such as may be formed by an embossing operation, where the valleys  44  on an adhesive side of the film are at least partially filled with a pressure sensitive adhesive  46 . The adhesive  46  is held out of engagement with an adjacent surface by the protrusions  42  until a sufficient pressure is applied to the side of the film opposite the adhesive side causing at least some of the protrusions  42  to collapse and allow contact of the adhesive with the adjacent surface, resulting in adhesion between the composite material and the adjacent surface. 
   As described, the currently preferred embodiment of the composite material can utilize either raised protrusions, or raised land areas surrounding dimples, to prevent premature sticking of the adhesive to an adjacent surface. However, other forms of composite materials that include a non-adhesive material to control the tack of the adhesive and prevent the adhesive from attachment to an adjacent surface prior to the application of pressure may also be used in accordance with the present invention. Exemplary materials include, without limitation, release liners such as silicone coated paper or coatings, inks, varnish, particles (talc, calcium carbonate, starch, wax beads and the like), nonwovens, scrim and fibers which are mixed with or coated upon the adhesive. The adhesive and/or non-adhesive coatings can either be continuous or non-continuous (discrete). Solid, pressure activated adhesives can also be used including, without limitation, microencapsulated adhesives that are coated continuously or in discrete patterns onto a film. In the case of microencapsulated adhesives and the like, pressure is applied to rupture the surface of the microcapsules to bring the adhesive into contact with an adjacent surface. Additional details and further examples of such composite materials, and information on their manufacture, may be found in U.S. Pat. Nos. 5,662,758; 6,489,022; 5,871,607; 6,194,062; 5,965,235; 6,193,918; 6,602,454; U.S. Patent Application Publications 2003/0218274 A1 and 2004/0142159 A1. However, as would be known to one of skill in the art, other forms of composite materials having an adhesive disposed thereon could be used in accordance with the present invention including any material having an adhesive disposed continuously or discontinuously thereon. 
   The complementary elements  26 ,  28  of the reusable closure  24  are located on opposing inner faces of the outer layers  30 ,  34  of the sidewalls  12 ,  14 , and the composite material  41  of the inner layers  32 ,  36  defines upper edges  48 ,  50  which are illustrated located in spaced relation from the reusable closure elements  26 ,  28 . The outer layers  30 ,  34  additionally include opposing longitudinal edges which are defined by the longitudinal seam edges  16 ,  18 , and the inner layers  32 ,  36  include longitudinal edges located at  49 ,  51  and located within a seam area defined by the longitudinal seam edges  16 ,  18 . 
   During a use of the storage bag  10 , the sidewalls  12 ,  14  are pressed together in areas surrounding the contents of the storage bag  10  (see  FIG. 5 ) to thereby expel air from the storage bag  10  and bring the inner facing surfaces  38 ,  40  of the inner layers  32 ,  36  into engagement with each other. The pressure applied by pressing the sidewalls  12 ,  14  together causes the adhesive on each facing surface  38 ,  40  to move into engagement with and adhere to the opposing facing surface  40 ,  38 , thereby retaining the inner layers  32 ,  36  in engagement with each other and preventing air from reentering the adhered areas. 
   In one embodiment, the outer layers  30 ,  34  may comprise films formed of low-density polyethylene (LDPE) having a thickness in the range of approximately 0.1-10.0 mils (0.0254-0.254 mm), and preferably in the range of approximately 1.5-2.0 mils (0.0381-0.0508 mm). The inner layers  32 ,  36  may comprise films of high density polyethylene (HDPE) having an unembossed thickness in the range of approximately 0.25 to 2.0 mils (0.00635-0.0508 mm) and an embossed caliper of approximately 4.0 mils (0.1016 mm). Thus, the LDPE material of the outer layers  30 ,  34  provides an outer storage bag surface visually similar to known commercially available storage bags. However, it should be noted that other materials and film thicknesses can be used for either of the layers of the sidewalls  12 ,  14 . 
   Examples of materials that may be used for the outer layers  30 ,  34  include, without limitation, thermoplastic materials or a blend of thermoplastic materials. The films may be made by a conventional cast or blown film process. Useful thermoplastics include, without limitation, polyolefins such as high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and polypropylene (PP); thermoplastic elastomers such as styrenic block copolymers, polyolefin blends, elastomeric alloys, thermoplastic polyurethanes, thermoplastic copolyesters and thermoplastic polyamides; polymers and copolymers of polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), saran polymers, ethylene vinyl acetate (EVA) copolymers, cellulose acetates, polyethylene terephthalate (PET), ionomer (Surlyn®), polystyrene, polycarbonates, styrene acrylonitrile, aromatic polyesters, linear polyesters, nylon, thermoplastic polyvinyl alcohols; foils and metalized films. 
   Examples of materials that may be used to form the composite material  41  for the inner layers  32 ,  36  include, without limitation, metal foils, such as aluminum foil, wax paper or grease proof paper, polymeric films, nonwoven webs, fabrics, paper and combinations thereof. Some non-limiting examples of polymeric films include, polyolefin films such as polyethylene including high density, linear low density, or low density; ethylene copolymers, such as ethylene vinyl acetate (EVA) copolymers or ethylene methyl acrylate (EMA) copolymer, polyethylene terephthalate (PET), polyethylene terephthalate glycol (PETG) copolymer; polypropylenes, polyethylene-propylene copolymers; polymers and copolymers of polyvinyl chloride (PVC), polyvinylidene chloride (PVDC); polystyrene; nylon, and other polymeric films with similar properties. 
   The combination of outer layers  30 ,  34  surrounding the inner layers  32 ,  36  provides a double-walled construction for the storage bag  10  in which the outer layers  30 ,  34  form an outer bag providing a first barrier or seal for the contents of the storage bag  10  when the reusable closure  24  is closed, and the inner layers  32 ,  36  provide a second barrier or seal to prevent or minimize contact of air with the contents of the storage bag  10  when the inner layers  32 ,  36  are pressed together. 
   The inner layers  32 ,  36  of the storage bag  10  are attached to the adjacent outer layers  30 ,  34  across substantially the entire surface area of the inner layers  32 ,  36 , such as may be provided by combining the composite material  41  with the film material forming the outer layers  30 ,  34  during extrusion and formation of the film material for the outer layers  30 ,  34 , as is described further below. Alternatively the inner layers  32 ,  36  and outer layers  30 ,  34  may be adhered to each other by an adhesive, by static combining, or by other known means for joining two material layers. 
   Referring to  FIG. 6 , an alternative configuration for the storage bag  10  is illustrated, identified by reference numeral  10 ′, and in which elements corresponding to the previous configuration are identified with the same reference numerals primed. As with the previous configuration of storage bag  10 , the storage bag  10 ′ comprises two opposing sidewalls  12 ′,  14 ′, each sidewall  12 ′,  14 ′ comprising plural layers, including a first layer  30 ′ and a second layer  32 ′ for the sidewall  12 ′ and a first layer  34 ′ and second layer  36 ′ for the opposing sidewall  14 ′. 
   The inner layers  32 ′,  36 ′ are connected to each other and to the outer layers  30 ′,  34 ′ along the longitudinal seams  16 ′,  18 ′( FIG. 7 ), and are alternatively further joined at an edge seam along bottom edge  20 ′ formed in a manner similar to the that of the longitudinal seams  16 ′,  18 ′. Further, lateral seams are provided at the upper edges  48 ′,  50 ′ between the inner layers  32 ′,  36 ′ and the outer layers  30 ′,  34 ′. 
   The inner layers  32 ′,  36 ′ may comprise a composite material where the inner faces  38 ′,  40 ′ of the inner layers  32 ′,  36 ′ may include a pressure sensitive composite material  41  of the same type described for the previous configuration of storage bag  10 . 
   As seen in  FIG. 6 , the inner layers  32 ′,  36 ′ are substantially unattached to the outer layers  30 ′,  34 ′ in the area between the longitudinal seams  16 ′,  18 ′ and between the upper edges  48 ′,  50 ′ and the bottom edge  20 ′. Thus, the inner layers  32 ′,  36 ′ may move independently of the outer layers  30 ′,  34 ′ for draping and closely conforming to the contents of the storage bag  10 ′ to thereby facilitate elimination of air contact with the contents. Accordingly, the described storage bag  10 ′ provides a combined function of protection and ease of use of a storage bag with the conformability provided by the pressure sensitive composite material  41 . 
   The storage bag  10 ′ may be used in a manner similar to that described for the storage bag  10 , where a user may apply pressure to the sidewalls  12 ′,  14 ′ of the bag  10 ′ to cause the inner faces  38 ′,  40 ′ of the inner layers  32 ′,  36 ′ to adhere to each other and thereby eliminate or minimize air contact with the contents of the bag  10 ′, as is illustrated in  FIG. 7 . The material of the inner layers  32 ,  36  provides drape or conformability characteristics which permit the inner layers  32 ,  36  to act as a wrap which closely conforms to the contours of the storage bag contents to minimize air contact with the contents. 
   Referring to  FIGS. 8 and 9 , an alternative embodiment for a storage bag  52  in accordance with the teachings of the present invention is shown. The storage bag  52  includes two opposing sidewalls  54 ,  56  that are attached together along a portion of a periphery of the sidewalls  54 ,  56 , such as along longitudinal edge seams  58 ,  60  and along a laterally extending bottom edge  62 . The longitudinal edge seams  58 ,  60  may be formed by sonic welding, heat sealing, an adhesive or other conventional attachment means along the edges of the material forming the sidewalls  54 ,  56 , and the bottom edge  62  may be defined by a fold in the material forming the sidewalls  54 ,  56 . Further, the bottom edge  62  may alternatively include an edge seam formed in a manner similar to that of the longitudinal edge seams  58 ,  60 . 
   An upper end of the storage bag  52  includes an open mouth  64  for insertion of articles into the interior of the storage bag  52 . A reusable closure  66  comprising complementary interlocking mating elements  68 ,  70  is located on the sidewalls  54 ,  56  at the mouth  64  for reclosably sealing the mouth  64  of the storage bag  52 . In the illustrated example, the reusable closure  66  comprises a slider  72  for manipulating the complementary interlocking mating elements  68 ,  70  into closed and open positions. However, it should be understood that an interlocking seal type closure, such as is illustrated in  FIGS. 1 and 2 , or any other reclosable closure, for example as described in the above-referenced patents relating to closure devices, may be provided. 
   As shown in  FIG. 9 , the sidewalls  54 ,  56  each comprise a film layer formed of a composite material having a characteristic that enables inner facing surfaces  74 ,  76  of the respective sidewalls  54 ,  56  to releasably adhere to each other. By way of example, the sidewalls  54 ,  56  are formed of a pressure sensitive composite material exhibiting the characteristic of releasably adhering to an adjacent contacting material surface upon application of pressure, while not adhering to the adjacent contacting surface in the absence of application of the pressure, such as a composite material constructed in accordance with the above-referenced teachings relating to the composite material  41 , described for the inner layers of the storage bags  10 ,  10 ′. 
   Alternatively, one of the sidewalls  54 ,  56  may be formed of a pressure sensitive composite material, such as a composite material constructed in accordance the above-referenced teachings relating to composite material  41 , and the opposing sidewall  54 ,  56  may be formed of a non-adhesive surface, such as a smooth material surface, where the one sidewall  54 ,  56  will adhere to the opposing non-adhesive surface to form a conforming seal around the contents of the storage bag  52 . Accordingly, the described storage bag  52  provides drape and conformability characteristics around the contents of the storage bag  52  to substantially isolate the contents from air, while also providing the ease of use of a storage bag construction including a reusable closure  66  to seal the storage bag mouth  64 . 
   It should be noted that the material forming the sidewalls  54 ,  56  of the storage bag  52  comprises an HDPE film, although other film materials providing the same composite material characteristics as those associated with the pressure sensitive composite material  41  may also be used. For example, the materials described above for the composite material of the inner layers  32 ,  36  may be provided for the sidewalls  54 ,  56 . 
   Referring to  FIGS. 10 and 11 , an alternative embodiment for a storage bag  78  in accordance with the teachings of the present invention is shown. The storage bag  78  includes two opposing sidewalls  80 ,  82  that are attached together along a portion of a periphery of the sidewalls  80 ,  82 , such as along longitudinal edge seams  84 ,  86  and along a laterally extending bottom edge  88 . The longitudinal edge seams  84 ,  86  may be formed by sonic welding, heat sealing, an adhesive or other conventional attachment means along the edges of the material forming the sidewalls  80 ,  82 , and the bottom edge  88  may be defined by a fold in the material forming the sidewalls  80 ,  82 . Further, the bottom edge  88  may alternatively include an edge seam formed in a manner similar to that of the longitudinal edge seams  84 ,  86 . 
   An upper end of the storage bag  78  includes an open mouth  90  for insertion of articles into the interior of the storage bag  78 . A reusable closure  92  comprising complementary mating elements  94 ,  96  is attached to the sidewalls  80 ,  82  at the mouth  90  for reclosably sealing the mouth  90  of the storage bag  78 . In the illustrated example, the reusable closure  92  comprises an interlocking seal type closure. However, it should be understood that a slider zipper seal type closure, such as is illustrated in  FIGS. 8 and 9 , or any other reusable closure, for example as described in the above-referenced patents relating to closure devices, may be provided. 
   The storage bag  78  includes a strip-like secondary seal  98  located in spaced relation to the reusable closure  92 . The secondary seal  98  comprises respective secondary seal elements  100 ,  102  positioned on inner facing surfaces  104 ,  106  of the sidewalls  80 ,  82 , located just below the complementary elements  94 ,  96 . The illustrated secondary seal elements  100 ,  102  comprise a composite material having a characteristic that enables inner faces  108 ,  110  of the secondary seal elements  100 ,  102  to releasably adhere to each other. For example, a composite material having the characteristic of adhering to an adjacent contacting material surface upon application of a pressure, while not adhering to the adjacent contacting surface in the absence of application of pressure, may be provided for the secondary sealing elements  100 ,  102 , such as a composite material constructed in accordance with the above-referenced teachings relating to the composite material  41 . Of course, only one of the secondary seal elements  100 ,  102  could also be used to form the secondary seal  98 . Further, secondary seal elements  100 ,  102  can be provided individually as continuous and/or discontinuous elements and in combination provide a continuous or discontinuous secondary seal  98  as could be recognized by one of ordinary skill in the art. 
   The sidewalls  80 ,  82  of the storage bag  78  may be formed of a LDPE film, or any of the films described herein, with reference to the outer walls  30 ,  34  of the storage bag  10 . The secondary seal elements  100 ,  102  may be formed of a HDPE film or any of the films describe with reference to the composite material  41  forming the inner walls  32 ,  36  of the storage bag  10 . 
   The secondary seal  98  preferably provides a visually recognizable seal separate and distinct from the reusable closure  92 . Alternatively, the secondary seal  98  may be provided within the same area as the reusable closure  92 . 
   The storage bag  78  provides a double-seal against entry of air to the interior of the storage bag  78 , as well as provides a double-seal against odors entering or leaving the storage bag  78 . The reusable closure  92  and the secondary seal element  98  of the double-seal construction further provides an additional closure element to secure the contents of the storage bag  78  should one of the seals inadvertently open. 
   In an alternative configuration of the storage bag  78 , only the composite material of the secondary seal  98  may be provided at the mouth  90  of the storage bag  78  to provide a single resealable closure element for the storage bag  78 . 
   In other alternative configurations of the storage bag  78 , the composite material secondary seal  98  may be located above the reusable closure  92 ; a pair of composite material secondary seals  98  may be provided, one on either side of the reusable closure  92 ; or a pair of composite material secondary seals  98  may be provided as first and second seals for the storage bag  78  without the reusable closure  92 . 
   In a further alternative configuration of the storage bag  78 , the secondary seal  98  may be formed of a reusable closure similar to the reusable closure  92 . For example, the storage bag  78  may be formed with a slider zipper seal closure for the reusable closure  92 , and the secondary seal  98  may comprise an interlocking seal closure. Alternatively, both the closure elements  92  and  98  may comprise an interlocking seal closure. 
   The above-described embodiments provide a bag structure for eliminating or minimizing air contact with the contents of a storage bag, which is particularly advantageous for storage bags used for freezing food articles such as meats. In addition to the above-described composite material incorporated in a bag structure, at least one of the bag walls may be provided with a passage, such as a valve passage (not shown), for permitting suction to be applied to evacuate air from the interior of the storage bag. The valve passage can be located anywhere in the bag below the interlocking closure but is preferably near the top of the bag. The film that is opposite to the valve and located in proximity to the valve passage preferentially contains no adhesive and is textured such that the film opposite to the valve does not block off the opening to the valve passage or significantly restrict the air flow through the valve passage. The valve passage may be any opening in the bag that permits the passage of air through the wall of the bag. The valve is preferably a one-way valve such that air cannot return into the bag. However, one of skill in the art would be able to select a particular valve or valve structure that provides the function desired in the final product. 
   In addition to withdrawing air through a valve passage, air can also be withdrawn through the primary bag opening prior to the interlocking strips being closed. One method for doing this is a suction nozzle that is placed into the partially closed bag whereby the bag is held tightly around the nozzle, for example through the assistance of clamps. Another method for withdrawing air through the primary opening of the bag is through the use of a vacuum sealing food storage device that utilizes a small vacuum chamber (e.g., as described in U.S. Pat. No. 4,941,310). In both cases, it is desirable to use a bag of the current invention that is textured on the inside surface of the bag but without adhesive at the top of the bag thereby allowing good air flow. The applied suction forces the two sides of the bags into intimate contact which are held together by the adhesive on the remaining portion of the bag. The two sides of the bag are held together thereby allowing excellent air evacuation from the bag and restricting air from reentering the bag. Also, other materials may be incorporated in one or more of the above-described embodiments, such as films formed of other polymer materials than those specifically mentioned herein, including the so-called cling-wrap materials, to facilitate closure of a storage bag from entry of air. 
   Referring to  FIG. 12 , a process for forming a storage bag material for the present invention is illustrated diagrammatically and includes an extruder  112  followed by a die  114  for forming a base material comprising a fluid (i.e., ranging in temperature from a molten temperature to the known glass transition temperature) film layer  116 , such as a LDPE layer of the film material in a fluid state, prior to a chilling step. The fluid film layer  116  is fed to a nip between a chill roll  118  and a nip roll  120  located at a water bath  122 . A layer of composite material, such as the embossed composite material  41 , is fed from a material supply  124  into the nip between the chill roll  118  and the nip roll  120  with the adhesive side of the composite material  41  facing away from the fluid film  116 . The fluid film  116  bonds to the composite material  41  as the two layers of material  116 ,  41  pass through the nip of the chill roll  118  and the nip roll  120  in order to form a double-layer sheet of material  126  which may be used to construct storage bags having a composite material inner layer. Attachment of the layer of composite material to the base material may be done by techniques known by those skilled in the art including thermal lamination, adhesive lamination, mechanical fastening such as embossing and the like. It is also contemplated that the base layer can be formed as a composite material with bags then being formed from the resulting composite material. 
   Referring to  FIGS. 13-15 , another embodiment of the storage bag is shown. The storage bag  1100  generally includes two opposing sidewalls  1112 ,  1114  that are attached together along a portion of a periphery of the sidewalls  1112 ,  1114 , such as along longitudinal edge seams  1116 ,  1118  and along a laterally extending bottom edge  1120 . An upper end of the bag includes a mouth  1122  for insertion of articles into the interior of the bag  1100 . A reusable closure  1124  comprising complementary mating elements  1126 ,  1128  may be located on the interior of the sidewalls  1112 ,  1114  near the mouth  1122  for reclosably sealing the bag  1100 . 
   As shown in  FIGS. 14-18 , each sidewall  1112 ,  1114  comprises an exterior layer  1130 ,  1131 , a middle adhesive layer  1132 ,  1133 , and a perforated layer  1134 ,  1135 . The exterior layer  1130 ,  1131  provides strength for the bag  1100  to support items placed within the bag  1100  and helps restrict the passage of air into the bag  1100 . The middle adhesive layer  1132 ,  1133  permits the opposing sidewalls  1112 ,  1114  of the bag  1100  to be attached to one another to seal the bag  1100  and conform the bag  1100  around an item contained therein. The perforated layer  1134 ,  1135  helps to keep the adhesive  1132 ,  1133  from making contact with the item contained within the bag  1100  and prevents the adhesive  1132 ,  1133  from unintentionally adhering to the opposing sidewall  1112 ,  1114 . The perforated layer  1134 ,  1135  has a plurality of perforations  1136 ,  1137  that permit the adhesive  1132 ,  1133  to adhere the opposing sidewalls  1112 ,  1114  to one another when pressure is applied to the bag  1100  by allowing the adhesive  1132 ,  1133  to enter the perforations  1136 ,  1137  as shown in  FIG. 16  and/or through the deformation of the exterior layer  1130 ,  1131  allowing the adhesive  1132 ,  1133  to make contact with the opposing sidewall  1112 ,  1114  of the bag as shown in  FIG. 17 . 
   The tack of the bag  1100  may be increased or decreased, for example, by altering the gauge of the perforated layer  1134 ,  1135 , the size of the perforations  1136 ,  1137 , and/or the pitch of the perforations  1136 ,  1137 . Although the bag  1100  is shown with both sidewalls  1112 ,  1114  comprising an exterior film  1130  having an adhesive  1132  and a perforated layer  1134 , the adhesive and perforated film may reside on only one sidewall  1112 ,  1114 . 
   The bag  1100  may be manufactured by any one of a plurality of manufacturing systems and processes. For example, turning to  FIG. 19 , the film for the exterior layer  1130  may be extruded by an extruder  1140  through a die  1142 . Upon leaving the die  1142 , the film moves through a casting roll  1144  and a pressure roll  1146  to control the thickness of the film. The film then passes through a coater  1148  that applies the adhesive layer  1132  to the film. Finally, a roll  1150  of perforated film  1134  is provided, and the perforated film  1134  is attached to the side of the exterior layer film  1130  having the adhesive  1132 . 
   The bag  1100  may also be manufactured as shown in  FIG. 20 . The film  1134  is extruded by an extruder  1152  through a die  1154 . The film  1134  then moves through a casting roller  1156  and a pressure roller  1158  to control the thickness of the film  1134 . The film then passes through a perforator  1160 , which creates the plurality of perforations in the film. As the perforated layer film  1134  exits the perforator  1160 , a roll  1162  of film (i.e., the exterior layer film  1130 ) coated with an adhesive layer  1132  is provided and attached to the perforated layer film  1134 . 
   In another embodiment shown in  FIG. 21 , the two processes described above may be operated simultaneously. As the exterior layer film  1130  exits the coater  1148  that applies the adhesive  1132 , it is combined with the perforated layer film  1134  as the perforated layer film  1134  exits the perforator  1160 . In yet another embodiment shown in  FIG. 22 , a roll  1150  of previously manufactured perforated film  1134  may be combined with a roll  1162  of previously manufactured exterior layer film  1130  coated with an adhesive  1132 . 
   Once the process is complete, the combination exterior layer film  1130 , adhesive  1132 , and perforated layer film  1134  may be cut and formed into the bag  1100 . 
   Turning to  FIGS. 23 ,  24 , and  25 , another embodiment of a storage bag  1200  is shown. In this embodiment, an inner bag  1310  is disposed within an outer bag  1210 . The outer bag sidewalls  1212 ,  1214  have exterior surfaces  1270 ,  1271  and interior surfaces  1272 ,  1273 . The inner bag  1310  also comprises sidewalls  1312 ,  1314  having exterior surfaces  1370 ,  1371  and interior surfaces  1372 ,  1373 . The inner bag sidewalls  1312 ,  1314  are attached to the interior surfaces  1272 ,  1273  of the outer bag sidewalls  1212 ,  1214 . In this embodiment, the inner bag sidewalls  1312 ,  1314  comprise an exterior layer  1330 ,  1331 , adhesive layer  1332 ,  1333 , and a perforated layer  1334 ,  1335  with perforations  1336 ,  1337  similar to the previous embodiment described above. Any one or more of the outer bag sidewalls  1212 ,  1214  and/or inner bag sidewalls  1312 ,  1314  may have an adhesive layer and a perforated layer such that the sidewall may adhere to an opposing sidewall. 
   Turning to  FIGS. 26 and 27 , another embodiment of a storage bag  1400  is shown. The storage bag  1400  in this embodiment comprises outer sidewalls  1412 ,  1414  having interior surfaces  1472 ,  1473  and exterior surfaces  1470 ,  1471 . The bag  1400  comprises a second layer or second set of sidewalls  1512 ,  1514  forming an inner bag  1510 . The inner bag sidewalls  1512 ,  1514  also have interior surfaces  1572 ,  1573  and exterior surfaces  1570 ,  1571 . The interior surfaces  1472 ,  1473  of the outer bag  1410  are attached to the exterior surfaces  1570 ,  1571  of the inner bag  1510 . This may be accomplished, for example, by laminating the inner bag  1510  to the outer bag  1410 . At least a portion of one or both of the interior surfaces  1572 ,  1573  of the inner bag sidewalls  1512 ,  1514  may be coated with an adhesive  1480  such that the opposing inner bag interior surfaces  1572 ,  1573  can be adhered to one another. 
     FIGS. 28 and 29  disclose another embodiment of a storage bag  1600 . This embodiment is similarly constructed as previous embodiments. In this embodiment, the inner bag  1710  is only attached to the outer bag  1610  near upper edges  1748 ,  1750  of the inner bag  1710  such that the inner bag  1710  hangs loosely within the outer bag  1610  instead of being laminated or attached to substantial portions of the sidewalls  1612 ,  1614  of the outer bag  1610 . As in the previous embodiment, an adhesive  1680  is disposed on the interior surfaces  1772 ,  1773  of the inner bag  1710 . As shown in  FIG. 54 , a user may substantially expel any air in direct contact with the item  1794  by conforming the inner bag  1710  around the item  1794  and using the adhesive  1680  in the inner bag  1710  to secure the inner bag  1710  around the item  1794 . The outer bag  1610  substantially retains its&#39; shape because the inner bag  1710  hangs loosely within the outer bag  1610 .  FIGS. 30 and 31  disclose another embodiment of a storage bag  1800  that is similar to the previous embodiment, except that the adhesive  1880  is only disposed on the interior surface  1972  of one side of the inner bag  1910 . 
     FIGS. 32 and 33  disclose another embodiment of a storage bag  2000 . This embodiment may be similarly constructed as previous embodiments. In this embodiment, the inner bag  2110  is attached to only one sidewall  2012 ,  2014  of the outer bag  2010 , thus creating a greater freedom of movement for the inner bag  2110  than certain other embodiments. This embodiment further permits the inner bag  2110  to be sealed independently from the outer bag  2010  and creates two storage compartments in the storage bag  2000  such that a user could place and maintain items separately within a single storage bag  2000 . It may be desirable, for example, to have a single bag with more than a single storage compartment. For example, a user could maintain a snack in compartment  2185  and a sandwich in compartment  2085 . Using the adhesive  2080 , the storage compartment  2185  may be sealed to keep the items in storage compartment  2185  from intermingling with the items stored in compartment  2085 . Although this embodiment is shown with adhesive  2080  on both sidewalls  2112 ,  2114  of the inner bag  2110 , an adhesive  2080  may be disposed on only one sidewall  2112 ,  2114 . 
     FIGS. 34 and 35  disclose another embodiment of a storage bag  2200 . This embodiment may be similarly constructed to previous embodiments. The inner bag  2310  in this embodiment has a single sidewall  2312 . Similar to the previously disclosed embodiment, this embodiment permits a user to place items within the bag  2200  and maintain the items separately with items disposed on either side of the inner bag sidewall  2312 . As shown in  FIG. 35 , an adhesive  2280  may be disposed on the inner surface  2372  of the inner bag  2310  such that the inner bag sidewall  2312  may be adhered to the opposing outer bag sidewall  2214  or a lower edge of the inner bag sidewall  2312  may be lifted and adhered to itself to essentially form a U-shape to contain items.  FIG. 36  shows another example of a storage bag  2400 , which is similar to the embodiment shown in  FIGS. 34-35 . As shown, an adhesive  2480  may be disposed on an inner surface  2473  of the outer bag  2410  opposing the inner surface  2572  of the inner bag  2510 .  FIG. 37  shows yet another example of a storage bag  2600 , which is similar to the embodiments shown in  FIGS. 34-36 . In this embodiment, an adhesive  2680  may be disposed on both the inner surface  2772  of the inner bag  2710  and an inner surface  2673  of the outer bag  2610 . Adhesive may be disposed on any one or more of the interior or exterior surfaces of the inner bag sidewall or the interior surfaces of the outer bag sidewalls. 
     FIGS. 38 and 39  disclose another embodiment of a storage bag  2800 . This embodiment is similarly constructed as previously disclosed embodiments. In this embodiment, the inner bag  2910  has a line of perforations  2890 ,  2891  on the opposing sidewalls  2912 ,  2914  of the inner bag  2910 . The line of perforations  2890 ,  2891  are substantially parallel with the upper edge  2948 ,  2950  of the inner bag sidewalls  2912 ,  2914 . The line of perforations  2890 ,  2891  permit the inner bag  2910  to be torn out along the line of perforations  2890 ,  2891  and removed from the outer bag  2810 . Alternately, the inner bag  2910  may be torn along a single perforated line  2891  such that it is similar to the embodiment disclosed in  FIGS. 32 and 33 . It may be desirable to remove the inner bag  2910 , for example, if the inner bag  2910  has become soiled by storing food or other items inside. The user may remove and discard the inner bag  2910  and still use the unspoiled outer bag  2810  for storage. Thus, the storage bag  2800  may be used at least twice without cleaning the inner bag  2910  or outer bag  2810  even if the items stored in the storage bag  2800  are relatively messy. 
   As another example, the inner bag  2910  may be torn out to wrap the inner bag  2910  around an item. The item wrapped in the inner bag  2910  may then be placed within the outer bag to provide two layers of protection for the item. This enables a user to provide a first layer of protection for the item being stored that conforms to the shape of the item and excludes nearly all of the air between the item and the inner bag  2910 . This enhances protection and extends the preservation of the item. 
   The line of tear perforations may be disposed at any suitable position on the inner bag or the outer bag. 
     FIGS. 40 and 41  disclose another embodiment of a storage bag  3000 . This embodiment is similar to the previously disclosed embodiment of  FIGS. 38 and 39  having perforated lines  3090 ,  3091 , but with the addition of an adhesive  3080  disposed on the interior surfaces  3172 ,  3173  of the inner bag  3110 . The adhesive  3080  may be disposed on one or both inner surfaces  3172 ,  3173  of the inner bag  3110 . As in the previous embodiment, this embodiment permits a user to remove the inner bag  3110 , wrap an item to be stored within the inner bag  3110 , and then place the wrapped item within the outer bag  3010  as described above. 
     FIGS. 42 and 43  disclose another embodiment of a storage bag  3200 . This embodiment is similar to the embodiments disclosed in  FIGS. 38-41 , although the line of perforations  3291  is made on only one sidewall  3314  of the inner bag  3310 . This enables a user to separate a sidewall  3314  of the inner bag  3310  from the outer bag  3210  such that a user can create a bag  3200  similar to the embodiment shown in  FIGS. 32 and 33 . An embodiment of a storage bag  3400  similar to the embodiment in  FIGS. 42 and 43  is disclosed in  FIGS. 44 and 45 , with the addition of adhesive  3480  on one or both inner surfaces  3572 ,  3573  of the inner bag  3510 . 
   The line(s) of tear perforations may be disposed at alternate positions such as is shown in  FIGS. 46-48 . This embodiment is similarly constructed as previous embodiments. The line of perforations  3690  in this embodiment of a storage bag  3600  is disposed near the bottom  3720  of the inner bag  3710  such that the sidewalls  3712 ,  3714  of the inner bag  3710  may be separated from one another. The inner bag may have a line of perforations permitting the inner bag to be torn at any one or more positions on the inner bag, including, but not limited to the locations shown in the above described embodiments. 
     FIGS. 49 and 50  disclose another embodiment of a storage bag  3800 . This embodiment may be similarly constructed as the previous embodiments. In this embodiment, the outer bag  3810  has one or more perforations  3895  disposed on one or both sidewalls  3812 ,  3814  of the outer bag  3810  to permit the passage of air into and out of the outer bag  3810 . These perforation(s)  3895  may be disposed at any suitable location on the outer bag  3810  and may be any suitable size such that air may pass more freely into and out of the outer bag  3810  than a bag having no perforations  3895  created thereon. These perforation(s)  3895  permit the venting of any air that has built up between the inner bag  3910  and outer bag  3810 . These perforation(s)  3895  also help to conform the inner bag  3910  around an item because as pressure is applied to the bag  3800 , any air between the inner bag  3910  and outer bag  3810  is able to escape so that the inner bag  3910  can more easily be manipulated around an item. 
     FIGS. 51-53  disclose another embodiment of a storage bag  4000 . This embodiment is similarly constructed as previous embodiments. In this embodiment, the inner bag  4110  has one or more perforations  4195  disposed on one or both sidewalls  4112 ,  4114  of the inner bag  4110 , and an adhesive  4080  is disposed on one or both sides of the interior surfaces  4172 ,  4173  of the inner bag  4110 . These perforation(s)  4195  may be disposed at any suitable location on the inner bag  4110  and may be any suitable size such that air may pass more freely into and out of the inner bag  4110  than an inner bag  4110  having no perforations  4195  created thereon. 
   In any of the embodiments of the invention having an inner bag with opposing sidewalls, the inner bag sidewalls may be connected along any one or more edges of the inner bag. For example, the inner bag sidewalls may be connected to one another near the respective bottom edge of the inner bag, but not at the side edges of the inner bag. As another example, the inner bag sidewalls may be connected to one another at the bottom edge and along one or both of the side edges. Thus, the inner bag would be similar to the outer bag and is able to enclose contents along three edges with an opening near the upper edges of the inner bag. 
   In any of the embodiments described above, any inner and/or outer bag seams or sidewall connections may be formed by sonic welding, heat sealing, an adhesive or other conventional attachment means along the edges of the material forming the sidewalls, and the bottom edge(s) may be defined by an edge seam as described above or a fold in the material forming the sidewalls. 
   The closure in any of the embodiments described above may comprise an interlocking seal type closure, and may or may not include a slider (such as the slider shown in  FIG. 8 ) for manipulating opening and closing of the bag. In other embodiments, the closure may by an adhesive. Thus, the present invention is not limited to the illustrated reusable closure, and examples of reusable closures that may be employed, and information on their manufacture, is described in U.S. Pat. Nos. 4,186,786; 4,285,105; 4,363,345; 4,561,109; 5,804,265 and 5,851,070. It will be appreciated that any suitable closure may be used. 
   Any one or more of the features in the embodiments described above may be utilized in a single storage bag. Furthermore, it will be understood that for those embodiments having an inner bag, the inner bag may be any suitable shape and/or size such that the inner bag may be disposed within the outer bag, including shapes and/or sizes that are not specifically illustrated in the figures for a given embodiment. 
   In embodiments having one or more perforations (such as on the inner bag, outer bag, a film disposed thereon, etc.) the perforations may be any suitable size, shape, and quantity. 
   Although the adhesive in many of the figures is shown on substantially the entire surface of a sidewall of the storage bag, it may alternately be disposed over only a portion of the respective sidewall. Further, in any of the embodiments described above, adhesive may be disposed on one or both of the outer bag sidewalls and/or one or both of the inner bag sidewalls. Additionally, the adhesive may be of any suitable type such that one sidewall is able to adhere to another sidewall. By way of example and not limitation, the bag may comprise a plurality of protrusions and valleys, such as may be formed by an embossing operation, where the valleys are at least partially filled with a pressure sensitive adhesive. The adhesive is held out of engagement with an adjacent surface by the protrusions until a sufficient pressure is applied to the side of the film opposite the adhesive side causing at least some of the protrusions to collapse and allow contact of the adhesive with the adjacent surface, resulting in adhesion between the composite material and the adjacent surface. 
   As described, the bag may utilize either raised protrusions, or raised land areas surrounding dimples, to prevent premature sticking of the adhesive to an adjacent surface. However, other structures or methods to control the tack of the adhesive and prevent the adhesive from attachment to an adjacent surface prior to the application of pressure may also be used. Examples of such materials may include, without limitation, release liners such as silicone coated paper or coatings, inks, varnish, particles (talc, calcium carbonate, starch, wax beads and the like), nonwovens, scrim and fibers which are mixed with or coated upon the adhesive. The adhesive and/or non-adhesive coatings can either be continuous or non-continuous (discrete). Solid, pressure activated adhesives can also be used including, without limitation, microencapsulated adhesives that are coated continuously or in discrete patterns onto a film. In the case of microencapsulated adhesives and the like, pressure is applied to rupture the surface of the microcapsules to bring the adhesive into contact with an adjacent surface. It will be appreciated, however, that other forms of adhesives and/or materials may be used. 
   In one embodiment, the adhesive may comprise a layer of a latex pressure sensitive adhesive about 0.001 inch (0.025 mm) thick. In other embodiments, the adhesive may comprise a layer of hot melt adhesive, specification no. Fuller HL-2115X made by H. B. Fuller Co. of Vadnais Heights, Minn., from about 0.0005 inch (0.013 mm) to about 0.002 inch (0.051 mm) thick. In further embodiments, the adhesive may comprise a layer of National Starch 3A-176A hot melt adhesive, available from the National Starch and Chemical company of Independence, Ky., from about 0.0005 inch (0.013 mm) to about 0.002 inch (0.051 mm) thick. Any adhesive can be used which suits the needs of the material application. Adhesives may be refastenable, releasable, permanent, or otherwise. In embodiments utilizing protrusions, described above, the size and spacing of protrusions may be selected to provide a continuous adhesive path surrounding protrusions so that air-tight seals may be made with a target surface. 
   The selected adhesive may provide the material with a wet seal adhesion peel force after activation of at least about 20 gf per inch of material. Alternatively, the wet seal adhesion peel force may be at least about 40 gf per inch. In another alternative, the wet seal adhesion peel force may be at least about 60 gf per inch. In still another alternative the wet seal adhesion peel force may be at least about 80 gf per inch. 
   Wet seal adhesion peel force is defined as the adhesion of a material to a surface wetted with water. Wet seal adhesion peel force is determined by the wet peel test set forth below. The National Starch 34-176A adhesive provided the material a wet peel adhesive of 100 gf per inch when tested. The adhesive may additionally provide a significant seal peel even after the seal has aged. The 34-176A adhesive provides a seal peel of at least about 80 gf per inch after the seal has been aged for 24 hours at 120 degrees Fahrenheit. Seal peel refers to the force requires to peel a portion of the material from a seal formed between two portions of the adhesive side of the material sealed together. 
   Wet Peel Test Procedure: 
   Three strips of material, each one inch in width are cut from a sheet of the material. An adhesive label is affixed to one end of each strip. The strips are stored with the adhesive side facing up and out of contact with any release liner. 
   A clean dry stainless steel plate, two inches by eight inches (5 by 20 cm) is weighed and the tare of the balance is set to the weight of the plate. Water is sprayed onto the plate and the plate is weighted again. The weight of the added water should be between 0.023 and 0.027 grams. 
   A clean glass plate, two inches by eight inches, (5 by 20 cm) should be used for the test. Water should be applied to the glass plate as it was applied to the steel plate. After the water is applied a strip of material should be placed upon the glass plate with the adhesive side facing the water. The strip should be smoothed and then rolled down using a Cheminstruments, RD3000, available from Cheminstruments Inc., of Fairfield, Ohio, applying ten pounds of force (44 N) to the strip at 24 inches (61 cm) per minute rolling the strip once in each direction along the length of the strip. The 90 degree peel test using the MTS tensile tester model 1G, available from MTS System Corp., of Eden Prairie, Minn., performing the Peel04 test at a test speed of 12 inches (30.5 cm) per minute with a test length of 5 inches (12.5 cm) and a gage length of 3 inches (7.5 cm), should then be performed within 30 seconds of the roll down of the strip. 
   In any of the embodiments having both outer bag sidewalls and at least one inner bag sidewall, the inner bag sidewall(s) may be made of either the same or different material than the outer bag sidewalls and may have the same or different thickness than the outer sidewall. Further, the inner and outer bag sidewalls may be constructed of any suitable material and have any suitable thickness. Examples of materials that may be used for the inner and/or outer bag sidewalls include, without limitation, thermoplastic materials or a blend of thermoplastic materials. The films may be made by a conventional cast or blown film process. Useful thermoplastics include, without limitation, polyolefins such as high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and polypropylene (PP); thermoplastic elastomers such as styrenic block copolymers, polyolefin blends, elastomeric alloys, thermoplastic polyurethanes, thermoplastic copolyesters and thermoplastic polyamides; polymers and copolymers of polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), saran polymers, ethylene vinyl acetate (EVA) copolymers, cellulose acetates, polyethylene terephthalate (PET), ionomer (Surlyn®), polystyrene, polycarbonates, styrene acrylonitrile, aromatic polyesters, linear polyesters, nylon, thermoplastic polyvinyl alcohols; foils, metalized films, wax paper or grease proof paper, nonwoven webs, fabrics, paper, ethylene copolymers, ethylene methyl acrylate (EMA) copolymer, polyethylene terephthalate glycol (PETG) copolymer, polyethylene-propylene copolymers, any suitable combinations thereof, and any other suitable materials. 
   It is contemplated that storage bags made in accordance with the teachings of the present invention can include any number of layers and that any number of layers can be used in any of the films used to make the bags by using processes known in the art including, without limitation, co-extrusion and lamination. For example, nylon or ethylene vinyl alcohol copolymer layers can be used to improve the flavor, aroma, and oxygen barrier properties of the bags. Further, one of skill in the art will realize that individual layers, or the components comprising an individual layer, utilized for the bag of the present invention can be selected to provide a specific functional or aesthetic requirement. In an exemplary, but non-limiting example, a UV-resistant layer can be provided within the structure of a layer comprising the bag of the present invention to prevent the photo-degradation of a product positioned within the bag. 
   For any two or more sidewalls laminated or otherwise adhered to one another, it will be appreciated that the sidewalls may be partially or fully laminated to one another. Similarly, for any sidewall comprising two or more layers laminated or otherwise adhered to one another, it will be appreciated that the layers may be partially or fully laminated to one another. 
   In accordance with an aspect of the invention, a storage bag is provided including a bag body comprising at least two opposing sidewalls including peripheral edges and the sidewalls being attached together along at least a portion of the peripheral edges. Each sidewall includes an outer layer and an inner layer with the inner layers defining opposing inner faces. At least one of the inner faces comprising a pressure sensitive composite material for bonding the opposing inner faces to each other. 
   In accordance with another aspect of the invention, a storage bag is provided including a bag body comprising at least two opposing sidewalls including peripheral edges and the sidewalls being attached together along at least a portion of the peripheral edges. Each of the sidewalls comprising an outer surface and an inner surface, the inner surfaces of the sidewalls being located in opposing facing relation to each other. At least one of the inner surfaces comprising a pressure sensitive composite material for bonding the at least two opposing sidewalls to each other. 
   In accordance with yet another aspect of the present invention, a process for forming a storage bag material comprises the steps of: providing a sheet of base film; providing a pressure sensitive composite material having an adhesive on one side thereof; moving the sheet of base film and the pressure sensitive composite material into overlaying engagement; and, attaching the pressure sensitive material to the sheet of base film. 
   The invention further provides a storage bag having a line of tear perforations disposed on the inner bag for tearing the inner bag along the line of tear perforations. 
   The invention further provides a storage bag wherein the line of tear perforations is disposed on at least one of the third and fourth sidewall. 
   The invention further provides a storage bag wherein the line of tear perforations is disposed at an intersection of the third and fourth sidewalls. 
   The invention further provides a storage bag wherein the third sidewall is laminated to the first interior surface of the first sidewall, and the fourth sidewall is laminated to the second interior surface of the second sidewall. 
   The invention further provides a storage bag wherein an adhesive is disposed on the fourth interior surface. 
   The invention further provides a storage bag having a film disposed over the adhesive on the third and fourth sidewalls. The film has a plurality of perforations. 
   The invention further provides a storage bag wherein the first, second, third, and fourth sidewalls have approximately the same width. 
   The invention further provides a storage bag wherein the third and fourth sidewalls are approximately the same size and are smaller than the first and second sidewalls in width. 
   The invention further provides a storage bag having one or more perforations in at least one of the third and fourth sidewalls. 
   The invention further provides a storage bag having a first and second sidewall. The first sidewall has a first interior surface and the second sidewall has a second interior surface. The first and second sidewalls are attached to one another along at least a portion of a periphery of the first and second sidewalls. An adhesive is disposed on a portion of at least one of the first and second interior surfaces. A film having a plurality of perforations is disposed over the adhesive such that the adhesive is disposed between the film and the at least one of the first and second interior surfaces. 
   The invention further provides a storage bag having an outer bag and an inner bag. The outer bag has a first sidewall and a second sidewall. The inner bag has a third sidewall and a fourth sidewall, and the inner bag is contained within the outer bag. The third sidewall is attached to a portion of the first sidewall, the fourth sidewall is attached to a portion of the second sidewall, and the third sidewall and fourth sidewall are attached to one another at an intersection of the third sidewall and fourth sidewall to define a bottom of the inner bag. A line of tear perforations is disposed on the inner bag for tearing the inner bag along the line of tear perforations. The line of tear perforations is disposed at a position other than at the intersection of the third sidewall and fourth sidewall. 
   The invention further provides a storage bag having a second line of tear perforations disposed on the inner bag. 
   The invention further provides a storage bag having an outer bag and an inner bag. The outer bag has a first sidewall and a second sidewall. The inner bag has a third sidewall and a fourth sidewall. The inner bag is contained within the outer bag. The third sidewall is attached to a portion of the first sidewall, and the fourth sidewall is attached to a portion of the second sidewall. A plurality of perforations is disposed on the outer bag. 
   The invention further provides a storage bag wherein the third sidewall and fourth sidewall are attached to one another at an intersection of the third sidewall and fourth sidewall to define a bottom of the inner bag. 
   The invention further provides a method of manufacturing a storage bag. A first film is extruded through a die. The first film is then coated with an adhesive. A second film having a plurality of perforations is provided and attached to the first film such that the adhesive is disposed between the first film and the second film. 
   The invention further provides that the second film is extruded through a die, and the plurality of perforations is created by passing the second film through a perforator. 
   The invention further provides another method of manufacturing a storage bag. The first film is extruded through a die. A plurality of perforations are created in the first film. A second film having an adhesive disposed on a surface of the second film is provided. The second film is attached to the first film such that the adhesive is disposed between the first film and the second film. 
   The invention further provides a method of manufacturing a storage bag. A first film is provided having a plurality of perforations. A second film having an adhesive disposed on a surface of the second film is also provided. The first film is attached to the second film such that the adhesive is disposed between the first film and the second film 
   It will be appreciated that like reference numbers may refer to like features in the drawings. Furthermore, while the structure and function of various features in the drawings may only be specifically described with respect to a particular embodiment, other embodiments shown and/or described may have one or more of those same features. Therefore, it will be appreciated that like shown features in the drawings may represent the same or similar feature shown in the other drawings regardless of whether a reference number is assigned for that feature in a given drawing or whether that feature is described with respect to a given embodiment. 
   While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention. 
   All documents cited in the present application are incorporated herein by reference to the same extent as if each document were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein. The citation of any document is not to be construed as an admission that it is prior art with respect to the present invention. 
   The use of the terms “a” and “an” and “the” and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention. 
   Preferred embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.