Patent Publication Number: US-2023157472-A1

Title: Tamperproof sack system for home package deliveries

Description:
This application claims benefit to U.S. Provisional Application No. 63/281,266 filed Nov. 19, 2021, the entire contents of which are hereby incorporated by reference. 
    
    
     BACKGROUND 
     1. Field 
     Exemplary embodiments disclosed herein relate to a tamperproof sack system for package delivery, protection, or transportation and more particularly, relate to a tamperproof sack system that includes one or more of a tamperproof sack, a strap, and a lock that can be accessed by a delivery person delivering a package. 
     2. Description of the Related Art 
     Recently, there has been a surge in demand for products to be delivered to consumers through home delivery. In particular, with the 2020 global COVID-19 pandemic and with the ascension of Amazon® as a global powerhouse in online shopping, consumers have demanded an ever-increasing amount of goods to be delivered to their homes. Consumers can now purchase a remarkable variety of items to be delivered to their house, from home goods and clothing to luxury items, toiletries, food, electronics, and many other types of items. 
     Generally, when a delivery person delivers a package to a home, the delivery person drops the package off at or near the front door of the home. The delivery person may also take a photograph of the package or otherwise document the delivery. However, quite frequently, the package itself remains completely unsecured until the homeowner returns home and brings the package inside. While the package is left outside, the package may be exposed to harsh weather conditions such as rain or snow, and also may be stolen or otherwise tampered with. According to several news reports, one in three Americans report having at least one Amazon® package stolen per year, resulting in $25 million of lost goods and services for Amazon® alone each day. 
     Thus, there is clearly a significant need for a home delivery system that can ensure the safety of packages delivered to a home. 
     There is further a need for a home delivery system that can be efficiently accessed by both a homeowner and a delivery person. 
     There is also a need for a home delivery system that has a flexible configuration and can be attached to and detached from various types of doors and fixtures of a house or dwelling. 
     SUMMARY 
     Exemplary embodiments disclosed herein relate to a tamperproof sack system including a tamperproof sack and one or more of a lock and a door strap, the tamperproof sack being attachable to a door via the door strap and configured to be locked and unlocked via the lock. 
     The tamperproof sack system according to exemplary embodiments disclosed herein provides a sack for home deliveries that is tamperproof and weatherproof, easy to lock and unlock using an access code provided to a delivery person, and simple to attach to and detach from a door. 
     Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented exemplary embodiments. 
     According to an aspect of an exemplary embodiment, there is provided a tamperproof sack system to securely contain a package, the tamperproof sack system including: a tamperproof sack made of material that satisfies a predetermined cut-resistance standard, the tamperproof sack including: a body having a bottom side, a top side opposite the bottom side, a left side that is substantially perpendicular to the bottom side, a right side that is substantially parallel to the left side, a front side, and a rear side opposite the front side, the body being configured to house the package therein; and an adjustable opening portion formed in the top side, the adjustable opening portion being configured to open and close; a door strap configured to secure the tamperproof sack to a door such that the rear side of the body is held against the door, the door strap being attached to the left side and the right side of the body and being configured to wrap around the door, the door strap including a door strap fastener configured to fasten the door strap to the door; and a lock including a keypad configured to receive user input, the lock configured to unlock the adjustable opening portion and thereby unlock the tamperproof sack based on whether the user input received at the keypad comprises a valid access code. 
     The lock may include: a lock body; a shackle comprising: a fixed end that is fixed to the lock body and rotatable, and a loose end that can be pulled up and out of a hole formed in the lock body to unlock the shackle and pushed back into the hole to lock the shackle; and a locking mechanism provided within the lock body and configured to release the loose end of the shackle in response to the valid access code being entered into the keypad. 
     The lock may further include: communication circuitry configured to receive an access code transmitted from a first digital communication device; and a memory configured to store the received access code as the valid access code. 
     The lock may further include a central processing unit (CPU) configured to, in response to the communication circuitry receiving the access code, overwrite any access codes previously stored in the memory with the received access code and store the received access code as the valid access code. 
     The communication circuitry may receive the access code at a predetermined frequency or based on a detected event. 
     The lock may further include: a sensor configured to sense an event occurring in a vicinity of the tamperproof sack system, wherein, in response to the sensor detecting the event, the CPU controls the communication circuitry to transmit a notification to the first digital communication device. 
     The lock may further include: a camera configured to record images or videos, wherein the CPU is configured to control the communication circuitry to transmit the recorded images or videos to the first digital communication device. 
     The tamperproof sack system may further include a drawstring provided in or otherwise affixed to the adjustable opening portion, the drawstring including: a cord including two ends; a barrel cord lock configured to lock the drawstring in a fixed position, the two ends passing through the barrel cord lock; and loops formed on the cord, wherein the drawstring is configured such that, when the barrel cord lock is pressed open and the two ends are pulled through the barrel cord lock, the loops are pulled outside of the adjustable opening portion so that the shackle can be passed through the loops to thereby lock the adjustable opening portion into a locked position. 
     The tamperproof sack system may further include: a flap configured to be pulled over the adjustable opening portion to thereby cover the adjustable opening portion; and a flap fastener including: a flap fastener inserting portion including a flap fastener inserting portion strap attached to an end of the flap and at least one protruding member attached to the flap fastener inserting portion strap; and a flap fastener receiving portion including a flap fastener receiving portion strap attached to the front side of the body and a hollow part configured to receive and attach to the at least one protruding member. 
     The flap fastener may include a side-release buckle strap. 
     The flap fastener inserting portion may further include a hole provided in the flap fastener inserting portion strap, the hole being configured to allow the shackle to pass therethrough so that the shackle can lock the flap fastener inserting portion in a closed position. 
     The door strap fastener may be implemented as a swivel lobster claw fastener comprising a swivel lobster claw clasp and an eye and is located inside of the door when fastened together. 
     The strap, which in certain embodiments is a door strap, may be made of the same type of material as the body that satisfies the predetermined cut-resistance standard. 
     The cut-resistance standard may be a standard established by European Standard (EN) or American National Standards Institute (ANSI). 
     According to an aspect of another exemplary embodiment, there is provided a tamperproof sack system to securely contain a package, the tamperproof sack system including: a tamperproof sack made of material that satisfies a predetermined cut-resistance standard, the tamperproof sack including a body having a bottom side, a top side opposite the bottom side, a left side that is substantially perpendicular to the bottom side, a right side that is substantially parallel to the left side, a front side, and a rear side opposite the front side, the body being configured to house the package therein; a door strap configured to secure the tamperproof sack to a door such that the rear side of the body is held against the door, the door strap being attached to the left side and the right side of the body and being configured to wrap around the door, the door strap including a door strap fastener configured to fasten the door strap to the door; a zipper and a track provided on the front side of the body, the zipper being configured to slide along the track to thereby open and close the tamperproof sack; and a lock including a keypad configured to receive user input, the lock configured to unlock the zipper from a closed position and thereby allow the zipper to slide along the track and unlock the tamperproof sack based on whether the user input received at the keypad comprises a valid access code. 
     The lock may include: a lock body; a shackle including: a fixed end that is fixed to the lock body and rotatable, and a loose end that can be pulled up and out of a hole formed in the lock body to unlock the shackle and pushed back into the hole to lock the shackle; a locking mechanism provided within the lock body and configured to release the loose end of the shackle in response to the valid access code being entered into the keypad; communication circuitry configured to receive an access code transmitted from a first digital communication device; and a memory configured to store the received access code as the valid access code. 
     The tamperproof sack system may further include at least one loop fixed on the top side of the tamperproof sack. 
     The zipper may include: a slider connected to the track; and a zipper pull connected to the slider, the zipper pull being configured to be pulled by a user to slide the slider back and forth along the track and thereby open and close the front side of the tamperproof sack, wherein the zipper pull includes a zipper pull hole formed therein, and wherein, when the zipper is pulled into the closed position which closes the track, the shackle is configured to pass through the zipper pull hole and the at least one loop, to thereby fix the zipper in place in the closed position. 
     The tamperproof sack system may further include: a zipper flap configured to cover the zipper; a flap configured to cover the zipper flap; a front side loop fixed on the front side of the tamperproof sack; a rear side loop fixed on the flap; and a flap fastener including a flap fastener inserting portion and a flap fastener receiving portion, wherein, when the zipper is pulled into a closed position and covered by the zipper flap and the flap is pulled over the zipper flap and fastened by the flap fastener, the shackle is configured to pass through the front side loop and the rear side loop, to thereby lock the flap in place and prevent access to the zipper. 
     According to an aspect of another exemplary embodiment, there is provided a method of delivering a package, the method including: receiving, at a second digital communication device, an access code transmitted from a first digital communication device; entering the access code into a keypad provided on a lock that locks closed an adjustable opening portion of a tamperproof sack to thereby unlock the lock, the tamperproof sack including a body having a bottom side, a top side opposite the bottom side, a left side that is substantially perpendicular to the bottom side, a right side that is substantially parallel to the left side, a front side, and a rear side opposite the front side, the body being configured to house the package therein, the adjustable opening portion being formed in the top side and configured to open and close, the tamperproof sack being secured to a door with a door strap that wraps around the door; opening the adjustable opening portion and placing the package inside the body of the tamperproof sack; and closing the adjustable opening portion and locking the adjustable opening portion closed using the lock. 
     According to an embodiment of the present disclosure, there is a tamperproof sack system to securely contain a package, the tamperproof sack system comprising: a tamperproof sack made of material that satisfies a predetermined cut-resistance standard, the tamperproof sack comprising: a body having a bottom side and a top side opposite, wherein the body defines an interior configured to house a package therein; and an opening portion formed in the top side, the opening portion being configured to opened and closed. In this embodiment, the predetermined cut-resistance standard is European Standard EN-2 or above. 
     According to an aspect of this embodiment, the tamperproof sack system according further comprises a strap configured to affix the tamperproof sack to a fixed object, and a lock. In one aspect of this embodiment, the fixed object is a door. In another aspect of this embodiment, the door strap is made of the same type of material as the body. In another aspect of this embodiment, the strap is integrally formed with the body. 
     In an aspect of this embodiment, the body is made from a material selected from the group consisting of one or more of high performance polyethylene, ultra-high molecular weight polyethylene, para-aramid, polyvinyl acetate, polyvinyl acetate yarn, steel wire, metal fiber, and fiberglass yarn, or combinations thereof. In an aspect of this embodiment, the body is made from ultra-high molecular weight polyethylene. 
     In an aspect of this embodiment, the body is made from a single unperforated piece of material. An aspect of this embodiment includes that the single unperforated piece of material is a single unperforated piece of ultra-high molecular weight polyethylene. 
     In an aspect of this embodiment, the tamperproof sack system further comprises a drawstring affixed to the opening portion and configured to open and close the opening portion, and a zip tie configured to keep the opening portion of the tamperproof bag closed. 
     According to an aspect of this embodiment, the body does not comprise perforations or holes other than the opening portion. 
     According to an aspect of this embodiment, the predetermined cut-resistance standard is European Standard EN-3 or above. 
     According to an aspect of this embodiment, the predetermined cut-resistance standard is European Standard EN-4 or above. 
     According to an aspect of this embodiment, the body is 0.1 to 6 feet long. 
     According to an aspect of this embodiment, the body is 6 to 60 feet long. 
     Another embodiment of the present disclosure is a method of preventing the unauthorized removal of items from the tamperproof sack system. The method includes the steps of: filling the tamperproof sack, attaching the tamperproof sack to a fixed object, and informing an authorized user of a method by which to open the tamperproof sack or detach the tamperproof sack from the fixed object. 
     According to an aspect of this embodiment, the method further includes a step of opening of the tamperproof sack by the authorized user. 
     Another embodiment of the present disclosure is a method of delivering objects, the method comprising the steps of, in order: a first authorized user accessing the tamperproof sack system and opening the tamperproof sack, inserting an object into the tamperproof sack, and closing the tamperproof sack. 
     According to an aspect of this embodiment, there is also a step of, after the step of closing the tamperproof sack, a second authorized user opening the tamperproof sack. 
     According to an aspect of this embodiment, there is also a step of securing the tamperproof sack to a fixed object either before or after the step of inserting the object into the tamperproof sack. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings in which: 
         FIG.  1 A  is a perspective view of a tamperproof sack system strapped to a door of a home, from the perspective of somebody standing outside of the home, according to an exemplary embodiment; 
         FIG.  1 B  is a perspective view of the tamperproof sack system of  FIG.  1 A , from the perspective of somebody standing inside of the home; 
         FIG.  2 A  is a view of the drawstring used in the tamperproof sack system of  FIG.  1 A  being opened and closed; 
         FIG.  2 B  is a close-up view of the tamperproof sack system of  FIG.  1 A  being opened and closed using the drawstring of  FIG.  2 A ; 
         FIG.  3    is a cross-sectional view showing the components of the lock, according to an exemplary embodiment; 
         FIG.  4 A  is a perspective view of a tamperproof sack system strapped to a door of a home, from the perspective of somebody standing outside of the home, according to another exemplary embodiment; 
         FIG.  4 B  is a close-up view of the tamperproof sack system of  FIG.  4    being opened and closed; 
         FIG.  5    is a close-up view of a modified version of the tamperproof sack system of  FIG.  4 A , according to yet another exemplary embodiment; and 
         FIGS.  6 A,  6 B,  6 C, and  6 D  illustrate a method of delivering a package to a home using the tamperproof sack system according to an exemplary embodiment. 
         FIGS.  7 A and  7 B  are views of an embodiment of the tamperproof sack with a closing mechanism. 
         FIGS.  8 A,  8 B, and  8 C  are views of an embodiment of the tamperproof sack. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, a tamperproof sack system according to exemplary embodiments will be described with reference to the accompanying drawings. 
     The tamperproof sack system according to exemplary embodiments includes a combination of features that achieve a remarkably safe and easy-to-use system to ensure the security of home deliveries. In particular, according to certain exemplary embodiments, the tamperproof sack system includes one or more of a tamperproof sack made of tamperproof and weatherproof material, a strap that enables the tamperproof sack to be securely fastened to a door or other fixture of a home or any other desired object, and an electronic lock that locks the tamperproof sack closed. A homeowner can transmit an access code to a delivery person, and the delivery person can then use the access code to unlock the electronic lock and store a package in the tamperproof sack. The delivery person can then lock the tamperproof sack to secure the package. The access code can be generated according to various criteria, such as generating the access code based on a predetermined frequency (e.g., daily, hourly) or based on an event (e.g., detecting the delivery person&#39;s arrival), to ensure that the access code changes frequently. Moreover, the door strap is configured to be easily fastened and unfastened to a door or other fixture, so that a homeowner can easily attach or detach the tamperproof sack to the door based on whether a package is expected. 
     The tamperproof sack may take the form of a bag or a box or another container. The tamperproof sack may have soft or hard sides defining an interior volume that may be filled with an object or used to contain an object, depending on the embodiment. In some embodiments, the tamperproof bag may have openings in its sides to permit, for example, breathability, so long as those openings do not allow for the unauthorized removal of an item therein or otherwise compromise the tamperproof nature of the sack. 
     The tamperproof sack according to the present disclosure is easy to set up and take down. It is lightweight based on the materials used as disclosed herein. 
       FIG.  1    is a cross-sectional view illustrating a tamperproof sack system according to an exemplary embodiment. As shown therein, the tamperproof sack system  100  includes a tamperproof sack  102 , a door strap  118 , and a lock  130 . The door strap  118  secures the tamperproof sack  102  to a door  101 , and the lock  130 , which includes a shackle  132 , a lock body  134 , and a keypad  136 , can be locked and unlocked in response to a valid access code being input into the keypad  136 , to thereby open and close the tamperproof sack  102 . 
     The tamperproof sack  102  includes a body  104  and an adjustable opening portion  106 . The body  104  includes a bottom side  104   a , a top side  104   b  opposite the bottom side  104   a , a left side  104   c  that is substantially perpendicular to the bottom side  104   a , a right side  104   d  that is substantially parallel to the left side  104   c , a front side  104   e  (i.e., the side facing out in  FIG.  1 A ), and a rear side  104   f  opposite the front side (the rear side  104   f  facing in and contacting the door  101 ). The body  104  further includes an adjustable opening portion  106  formed in the top side  104   b . When the adjustable opening portion  106  is opened, an opening  108  is formed in the top side  104   b  so that a delivery person can insert a package into the tamperproof sack  102  or a homeowner can remove the package from the tamperproof sack  102 . When the adjustable opening portion  106  is closed, the opening  108  is closed. In the example shown in  FIG.  1 A , the left and right sides  104   c  and  104   d  are longer than the top and the bottom sides  104   b  and  104   a  to form a substantially rectangular sack shape. However, exemplary embodiments of the tamperproof sack  102  are not limited to any particular dimensions, size, or shape. 
     The body  104  of the tamperproof sack  102  is made of a material that is tamperproof and weatherproof, to protect packages from theft and harsh weather conditions, such as rain, wind, sleet, snow, and prolonged sun exposure. The body  104  may be made of a material that is cut-resistant, tear resistant or and/or puncture-resistant so that the body  104  cannot be easily cut, torn, or punctured by thieves. For example, the body  104  may be made of various types of fabrics manufactured by Kozane®, which achieve maximum cut, tear, and puncture resistance. Of course, the body  104  is not limited to being made of any particular type of material, and may be made of many different types of materials, such as ultra-high molecular weight polyethylene (UHMWPE), para-aramids (such as Twaron® or Kevlar®), high performance polyethylene (HPPE) (such as Dyneema® or Spectra®), polyvinyl acetate (PVA), special PVA yarns (such as SupraBlock®), steel wire, metal fibers, chain links made from various materials, fiberglass yarns, or the like, or combinations thereof. In some embodiments, the body includes at least 90% by weight of the materials listed above. In other embodiments, the body includes at least 95%, 98%, or 99% by weight of the materials listed above. In certain embodiments, the body consists of 100% by weight of the materials listed above. In some embodiments, the material making up the body does not include metal fibers or does not include chain links, in particular chain links made from metal. In other embodiments, the material making up the body does not include wire. In other embodiments, the body does not include wire and/or does not include metal at any point surrounding a drawstring, but may include wire and/or metal in other parts of the body. Thus, a drawstring, if affixed to the body, does not go through wire and/or metal at any point in certain embodiments. The body  104  may be manufactured to comply with various types of cut resistance standards and other types of standards, such as standards governing puncture resistance and tear resistance. Examples of these standards include the European Union (EN) standards and the American National Standards Institute (ANSI)/ISEA standards. The term “tamperproof” as used throughout this specification may refer to a material that provides a predetermined degree of resistance to tampering, theft, cutting, tearing, or puncturing. In other words, the “tamperproof” material satisfies certain standards with respect to at least one of cut-resistance, tear-resistance, and/or puncture-resistance. For example, the “tamperproof” material may satisfy an EN cut-level 3 (where the EN levels range from 1-5). In preferred embodiments, the tamperproof sack satisfies an EN cut-level of 2 or more. In other embodiments, an EN-3 cut-resistance level may be used. For higher levels of tamperproof behavior, an EN cut-level of 4 or 5 may be used. The level of cut-resistance that may be present in the material for the tamperproof sack is not particularly limited, and may be selected from any range within the EN-1 to EN-5 range. Alternatively, the “tamperproof” material may satisfy an ANSI cut-level A6 (where the ANSI levels range from A1-A9). Also, different versions of the tamperproof sack  102  could be manufactured to satisfy different “tamperproof” standards according to EN1-EN5 or A1-A9. For example, a lightweight tamperproof sack  102  might be manufactured to satisfy a lower cut-resistance level (e.g., ANSI cut-level A2), whereas a heavyweight tamperproof sack  102  might be manufactured to satisfy a higher cut-resistance level (e.g., ANSI cut-level A8 or above). Higher tamperproof resistance may be provided by using material having a cut-resistance level of A4 or above. In preferred embodiments, the cut-resistance level is A2 or above, for example to A9. In more preferred embodiments, the cut-resistance level is from level A4-A7. The range of cut-level resistance in the material is not particularly limited, and may be from A1-A9 as appropriate for a given application. Many different options are possible. The material used for the tamperproof material is not particularly limited as long as it meets the tamperproof standards noted herein. In certain embodiments, the tamperproof sack may be made to be waterproof. The means of waterproofing the tamperproof sack is not particularly limited. In preferred embodiments, the material may be UHMWPE and may provide an ANSI-A6 level of protection or above. The UHMWPE preferably has a Mw of over 1,000,000, and is preferably in the range of from 1,000,000 to 10,000,000 or above. In preferred embodiments, the Mw is in a range of from 1,000,000 to 7,500,000. An appropriate Mw may be selected as long as it provides the desired tamperproof properties and yield strength (for example, a desired cut resistance). 
     In some embodiments, the tamperproof sack does not contain holes or openings other than the opening  108  through which an object may be inserted into the tamperproof sack. Accordingly, in those embodiments, the tamperproof sack has only one opening—opening  108 . In other embodiments, the tamperproof sack may contain perforations or holes that are not large enough for an unauthorized user to touch, or in some embodiments to remove, an object inside the tamperproof sack. For example, the tamperproof sack may contain perforations or openings other than the main opening, for example, on its sides, that are no larger than 4 inches in diameter, length, or width. Preferably, the perforations or openings are less than 3 inches, less than 2 inches, or less than 1 inch in diameter, length, or width. In preferred embodiments, the openings are less than ½ inch or less than ¼ inch in diameter, length, or width. On other embodiments, the openings are less than 1/10 inch or less than 1/100 inch in diameter, length or width. Other embodiments may include perforations or openings 1 micron or less in diameter, length, or width. 
     The tamperproof sack may be made using one layer of material or multiple layers of material. The layers of material may be made from the same or different materials as noted herein, so long as the tamperproof nature of the tamperproof sack is not compromised. Where the tamperproof sack has perforations or openings as noted above, the layers of material may be arranged such that even if the perforations or openings in an individual layer are larger than those values listed above, the multiple layers are arranged such that the openings of the tamperproof sack as a whole are not larger than the values noted above. 
     The body  104  further includes the adjustable opening portion  106  which can be adjustably opened and closed using various opening and closing mechanisms. In the exemplary embodiment shown in  FIG.  1 A , the adjustable opening portion  106  is the portion of the body  104  that forms a perimeter around the opening  108 , and is a substantially circular shape. The tamperproof sack  102  includes a drawstring  110  (see  FIG.  2 A ) that is used to open and close the adjustable opening portion  106 . 
     As shown in  FIG.  2 A , the drawstring  110  includes a cord  110   a  which is a long, thin piece of material.  FIG.  2 A  illustrates the drawstring  110  by itself, and  FIG.  2 B  illustrates the drawstring  110  in use in the tamperproof sack  102 . The cord  110   a  may be made of various types of materials, such as metal wire, plastic, various types of fabrics, etc. The cord  110   a  may be made of material similar to the body  104 , such that the cord  110   a  is also cut-resistant, tear resistance or and/or puncture-resistant. The two ends  110   b  of the cord  110   a  (also referred to as “cord ends”) are passed through respective openings in a barrel cord lock  110   d  and typically tied together or otherwise fastened together, to thereby maintain the cord  110   a  in a large loop shape. The barrel cord lock  110   d  is a cylindrical locking mechanism having a main cylindrical body that includes two openings to allow the respective cord ends  110   b  to pass therethrough, and further includes a smaller cylinder provided inside of the main cylindrical body. A spring or other elastic mechanism is typically provided inside of the main cylindrical body to keep the smaller cylinder into a locked position. When a user presses the smaller cylinder, the openings in the main cylindrical body are opened to allow the cord ends  110   b  to pass through, thereby allowing the cord  110   a  to be pulled tighter or loosened up. When a user releases the smaller cylinder, the openings in the main cylindrical body are closed to fix the cord  110   a  into a fixed position. The drawstring  110  further includes two loops  110   c  through which a shackle  132  of the lock  130  can be passed therethrough to lock the adjustable opening portion  106  into a closed position. 
     More specifically, as shown in  FIG.  2 A , on the left-hand side of  FIG.  2 A , the drawstring  110  is fixed in an open position, and on the right-hand side of  FIG.  2 A , the drawstring  110  is fixed in a closed position. To transition from the open to closed position, a user presses the barrel cord lock  110   d  to release the cord  110   a  from the fixed open position and then pulls the cord ends  110   b  through the barrel cord lock  110   d , to thereby tighten the drawstring  110  into the closed position. Then, the user can release the barrel cord lock  110   d  to fix the drawstring into the closed position. 
       FIG.  2 B  illustrates the drawstring  110  in use with the tamperproof sack  102 . As shown in the left-hand side of  FIG.  2 B , in the open position, the drawstring  110  is almost completely sealed within the adjustable opening portion  106 , except for the cord ends  110   b  and barrel cord lock  110   d  that are exposed outside of the adjustable opening portion. The drawstring  110  can be sealed within the adjustable opening portion  106  using various techniques, such as, for example, by sewing the drawstring  110  within the adjustable opening portion  106 . To close the adjustable opening portion  106 , the user presses the barrel cord lock  110   d  to release the cord  110   a  from the fixed open position, pulls the cord ends  110   b  to thereby pull the cord  110   a  into a closed position, and then releases the barrel cord lock  110   d  to fix the cord  110   a  and the adjustable opening portion  106  into the fixed closed position (shown on the right-hand side of  FIG.  2 B ). The user can pull the cord ends  110   b  until the two loops  110   c  on the cord  110  are pulled out of the adjustable opening portion  106  and are exposed outside. At this point, the user can pass the shackle  132  of the lock  130  through the two loops  110   c  and lock the shackle  132  into place, thereby locking the adjustable opening portion  106  into a closed position. The two loops  110   c  can be configured such that, in the fixed closed position, the adjustable opening portion  106  is completely sealed or almost completely sealed so that a thief could not reach his or her hand into the tamperproof sack  102 . Also, although the example in  FIGS.  2 A and  2 B  illustrates a drawstring configuration having two loops  110   c , exemplary embodiments are not limited to using two loops  110   c , and three or more loops may be used in various arrangements. 
     The tamperproof sack  102  further includes a flap  112  which is configured to be pulled over the adjustable opening portion  106  and fastened in place. The flap  112  is optional and provides an additional layer of covering for the adjustable opening portion  106  and the lock  130 . As shown in  FIG.  2 B , the flap  112  includes a flap fastener inserting portion  114  attached to an end of the flap  112 . The flap fastener inserting portion  114  incudes a flap fastener inserting portion strap  114   a , at least one protruding member  114   b , and a hole  114   c . Moreover, the tamperproof sack  102  includes a flap fastener receiving portion  116  which is fixed to the front side  104   e . The flap fastener receiving portion  116  includes a flap fastener receiving portion strap  116   a  and a hollow part  116   b . The flap fastener inserting portion  114  and the flap fastener receiving portion  116  may collectively be referred to as the “flap fastener”. The flap fastener inserting portion  114  may be attached to the flap  112  in various ways, such as by sewing the flap fastener inserting portion strap  114   a  to the flap  112  or by manufacturing the flap fastener inserting portion  114  out of the same piece of material as the flap  112 . The flap fastener receiving portion  116  may be formed in a similar fashion. In the exemplary embodiment shown in  FIGS.  2 A and  2 B , the flap fastener is implemented as a side-release buckle strap, where the flap fastener inserting portion  114  includes the flap fastener inserting portion strap  114   a  and three protruding members  114   b  formed at the end thereof, and the flap fastener receiving portion  116  includes the flap fastener receiving portion strap  116   a  having a hollow part  116   b  that has holes in the sidewalls formed at the end thereof. When the protruding members  114   b  are inserted into the hollow part  116   b , the protruding members bend to fit inside of the hollow part  116   b  and then snap back out of the holes in the sidewalls, to thereby fasten the flap fastener inserting portion  114  to the flap fastener receiving portion  116 . Also, the flap fastener can optionally be configured to be locked by the lock  130 . For example, the shackle  132  of the lock  130  can pass through the hole  114   c  when the flap fastener is locked, to thereby lock the flap  112  in place. This configuration provides an additional layer of security. The flap fastener can be locked to the lock  130  using many different types of configurations, e.g., holes in the strap, additional fastening devices, etc., and exemplary embodiments are not limited to any particular configuration. 
     The tamperproof sack  102  further includes a strap configured to affix the tamperproof sack to a fixed object. The strap may be configured to affix the tamperproof sack to any suitable object, such as a door, mailbox, fence, fence post, railing, tree, support column, gate, car, truck, truck bed, an item anchored or bolted into the ground or other object, or other fixed object that is difficult to move. Element  118  illustrates an embodiment of the strap as a door strap  118  that is configured to be wrapped around a door  101 . The door strap  118  can be made of a material that is cut-resistant, tear resistance or and/or puncture-resistant so that the body  104  cannot be easily cut, torn, or punctured by thieves, similar to the material used to make the tamperproof sack  102 . The door strap  118  is not limited to being made of any particular type of material. The door strap  118  can be integrally formed from the same piece of material as the tamperproof sack  102 , or can be formed as a separate piece that is attached to sides of the tamperproof sack  102 . When formed as a separate piece, ends of the door strap  118  can be respectively connected to the left side  104   c  and right side  104   d  of the tamperproof sack  102  using various techniques, such as sewing the ends of the door strap  118  to the left and right sides  104   c  and  104   d . The strap may be made from the same material as the tamperproof sack or may be made from a different material. In some embodiments, the strap may be integrally formed with the tamperproof sack from a single piece of material or from the same pieces of material as the tamperproof sack. In other embodiments, the strap may be attached to the tamperproof sack. The method for attaching the strap to the tamperproof sack is not particularly limited, but should not diminish the tamperproof ability of the combined tamperproof sack and strap. For example, the strap may be affixed to the tamperproof sack using a method disclosed below relating to how the tamperproof sack may be made. 
     As shown in  FIG.  1 B , which is a perspective view of the tamperproof sack system  100  from the perspective of somebody standing inside of the home, the door strap  118  wraps around the door  101  and is fixed in place using the door strap fastener  122 . The door strap may include a thin portion  120  where the door strap  118  wraps around corners of the door  101 . In the example shown in  FIG.  1 B , the door strap fastener  122  is implemented as a swivel lobster claw-style fastener, which includes a swivel lobster claw clasp  122   a  and an eye  122 . To fasten the door strap fastener  122  into place, a user opens the swivel lobster claw clasp  122   a , hooks the opened lobster claw clasp  122   a  into the eye  122   b , and then closes the swivel lobster claw clasp  122   a  to lock the swivel lobster claw clasp  122   a  in place. The swivel lobster claw-style fastener is very easy to fasten and unfasten, and can be designed using high-strength metal alloy components that enhance the strength of the system  100 . Of course, exemplary embodiments are not limited to using a swivel lobster claw clasp as the door strap fastener  122 , and many other types of fasteners can alternatively be used as the door strap fastener  122 , such as buckles (e.g., side-release buckle straps), Velcro straps, buttons, zippers, hooks, etc. 
       FIG.  3    is a cross-sectional view showing the components of the lock  130 , according to an exemplary embodiment. As shown therein, the lock  130  includes the shackle  132 , the lock body  134 , a keypad  136 , a locking mechanism  338 , communication circuitry  340 , a central processing unit (CPU)  342 , a memory  344 , sensors  346 , and a camera  348 . 
     The shackle  132  is made out of brass, stainless steel, hardened streel, an alloy or combination of alloys, or some other type of high-strength material. The shackle  132  typically includes metal or metal alloy, although is not limited to such. The shackle  132  has a curved shape resembling an upside-down U, and has two ends  132   a  and  132   b  connected to the lock body  132 . The first end  132   a  (also referred to as the “fixed end  132   a ”) is fixed to the lock body  132  and is rotatable, and the second end  132   b  (also referred to as “loose end  132   b ”) can be pulled up and out of a hole  132   c  formed in the lock body  132  to unlock the lock  130 , and can be inserted back into the hole  132   c  to lock the lock  130 . When the shackle  132  is unlocked, the loose end  132   b  can be pulled up and out of the lock body  132  and rotated about the rotatable first end  132   a , so that the shackle  132  can be passed through various components (e.g., guided out of the loops  110   c ). 
     The lock body  134  houses each of the electrical and locking components therein, and is made out of a high-strength material, similar to the shackle  132 . In the example shown in  FIG.  3   , the lock body  134  has a substantially circular shape, although exemplary embodiments are not limited thereto, and the lock body  134  can have many different shapes and sizes, e.g., rectangular, square, cylindrical, etc. 
     The keypad  136  includes a series of keys that can be pressed by a user to lock and unlock the lock  130 . The keys can include any combination of numbers, letters, or symbols. For example, the keypad  136  can include a standard numerical layout including twelve keys, one for each single-digit number and two additional keys for the pound (#) and star (*) symbols, as is frequently used on phones. Alternatively, the keypad  136  can include only a few keys, e.g., three keys, four keys, five keys, etc., with corresponding numbers (e.g., keys 1-5). In the example shown in  FIG.  2 B , the keypad  136  includes a series of twelve keys  137  that are implemented as physically protruding mechanical buttons sticking out from the lock body  134 . However, exemplary embodiments are not limited to this configuration. For example, the keypad  136  can be implemented as electronic pushbuttons, a digital touch screen, a dial, or any other device that can be used to input an access code. The keypad  136  can be electronic (e.g., battery powered) or manual. 
     The locking mechanism  338  is a series of components that collectively function together to lock and unlock the shackle  132  based on whether an access code is correctly input to the keypad  136 . The locking mechanism  338  can include, for example, a series of spring-loaded pins, racks, gears, and other physical hardware components that interoperate to lock and unlock the shackle. When the correct (e.g., valid) access code is input to the keypad  136 , the locking mechanism unlocks the shackle  132 . When an incorrect (e.g., invalid) access code is input to the keypad  136 , the locking mechanism keeps the shackle  132  locked. The locking mechanism  338  is not limited to any particular configuration, and many different types or combinations of locking mechanisms  338  may be used in the lock body  130 . 
     The communication circuitry  340  is circuitry configured to transmit data to and receive data from other digital devices, such as digital devices being used by a homeowner and a delivery person. The communication circuitry  340  is implemented as at least one network module having at least one antenna  341 . Generally, a network module includes a combination of hardware and software that is specially configured to transmit and receive data according to at least one type of data telecommunications standard, e.g., 4G, 5G, BLUETOOTH, Wi-Fi, etc., using the antenna  341 . The network module may a chipset, system on chip (SoC), or component thereof that supports data communication. The antenna  341  may be configured as one or a plurality of multiple input, multiple output (MIMO) antenna groups. Exemplary embodiments are not limited to any particular configuration of antennas. For example, the antenna may be physically located inside or outside of the respective network module. 
     The CPU  342  controls overall operations of the components located within the lock body  134 . Specifically, the CPU  342  controls operations of the keypad  136 , the communication circuitry  340 , the memory  344 , the sensors  346 , the camera  348 , and the battery  350 . The CPU  342  may be connected to the other components via electrical wire  343 . The electrical wire  343  may be implemented as a series of a wires, a bus, or any other configuration that enables data communication between the CPU  342  and the other components. 
     The memory  344  stores access codes that are used to lock and unlock the lock  130 . The memory  344  may be implemented as various types of memory devices, such as RAM, SRAM, DRAM, PROM, EPROM, EEPROM, flash memory, on-chip memory, ROM, optical disc drives, cloud-based storage, and other types of non-transitory storage media. In operation, when a new access code is received by the communication circuitry  341 , the CPU  342  controls the memory  344  to store the new access code as a valid access code. Also, the CPU  432  may control the memory  344  to overwrite any previously stored access codes or otherwise mark the previously stored access codes as invalid. 
     The sensors  346  include at least one sensor that may be used to detect events occurring near the tamperproof sack system  100 . For example, the sensors  346  may include a photosensor that detects an ambient brightness level. Thus, when a delivery person approaches the tamperproof sack system  100  and unfastens the flap  112 , the sensors  346  may sense the sudden increase in brightness level and generate an alert that can be transmitted (via the communication circuitry  340 ) to a homeowner, to inform the homeowner that somebody is accessing the tamperproof sack system  100 . The sensors  346  may alternatively be implemented as a noise sensor (e.g., a microphone, to detect noise), a motion sensor (e.g., an accelerometer, to detect whether the sack  102  is being moved), and/or other types or combinations of sensors. Moreover, the sensors  346  may also include various types of sensors that are configured to exchange data with another device. For example, the sensors  346  may include a near-field communication (NFC) sensor to exchange data with a delivery person or somebody else. The sensors  346  may also be omitted. 
     The camera  348  is an optical recording device that can record images or video and transmit the recorded images or video to a homeowner. The camera  348  can be implemented as many different types of camera, e.g., compact digital cameras, NEST® cameras, etc. In operation, the camera  348  can be used to transmit videos to the homeowner to alert the homeowner that somebody is accessing the tamperproof sack system  100  in real-time. In this case, the camera  348  can also be used in combination with the sensors  346 . For example, the sensors  346  can indicate that the tamperproof sack system  100  is being accessed, which can trigger an alert to the user (via the communication circuitry  340 ), and can also trigger a command to the camera  348  to turn on and start recording. Alternatively, the camera  348  can simply record video without providing real-time alerts. 
     The battery  350  provides electrical power to the other electrical components within the lock body  134 , including the communication circuitry  340 , the CPU  342 , the memory  344 , the keypad  136 , the sensors  346 , and the camera  348 . Also, if the locking mechanism  338  includes electrically powered components, the battery  350  may also provide electrical power to the locking mechanism  338 . 
     To securely facilitate the delivery of packages using the tamperproof sack system  100 , the lock  130  operates as follows. First, the homeowner uses her or his digital device  350  (also referred to as a “first digital communication device  350 ”) to generate a new access code  360  (also referred to as an “access code  360 ”) which is a valid access code that can be used to unlock the lock  130 . The access code  360  can be any series if numbers, letters, or symbols that are compatible with the keypad  136 . The first digital communication device  350  can be a smartphone, a laptop computer, a desktop computer, a security system interface, a combination of devices, or any other type of digital device configured to transmit data. When the first digital communication device  350  is a smartphone, the smartphone can generate the new access code  360  by using an application  352  stored on the smartphone. The application  352  can be a specially configured program designed to generate new access codes based on a predefined event or a predetermined frequency. For example, the application  352  can generate a new access code  360  in response to a user manually selecting an option to generate the new access code  360 . Alternatively, the application  352  can generate a new access code  360  according to a predefined frequency, such as generating a new access code  360  once a day or once an hour. As another alternative, the application  352  can generate the new access code  360  in response to detecting an event, such as the sensors  346  detecting the presence of a Delivery person in a vicinity of the tamperproof sack  102 . Many different criteria may be used to generate the new access code  360 . 
     Once the application  352  generates the new access code  360 , the first digital communication device  350  transmits the new access code  360  to both the lock  130  and the delivery person&#39;s digital device  352  (also referred to as a “second digital communication device  352 ”). Many different techniques and communication channels can be used to ensure that the access code  360  is correctly transmitted to the second digital communication device  352 . For example, the delivery person can provide his or her phone number or email ahead of time, and the homeowner can manually text or email the access code  360  using the phone number or email address, or the application  352  can automatically transmit the access code to the phone number or email address. Alternatively, the first digital communication device  350  can automatically transmit any newly generated access codes  360  to a central phone number or email controlled by the delivery company, such as a central phone number or email used by Amazon®. The delivery company can then, in turn, provide the access code  360  to the delivery person. 
     The lock  130  receive the new access code  360  via the communication circuitry  340  and the CPU  342  stores the access code  360  in the memory  344 . If the memory  344  is currently storing a previously generated access code, the CPU  342  can overwrite the previously generated access code with the new access code  360 . 
     Alternatively, the memory  344  can simply store every new access code  360  without overwriting or erasing the previously stored access codes. Also, optionally, the memory  344  can store a “master” access code that is only known by the homeowner and that is not updated or changed, and is not shared with any delivery people. The “master” access code is a fixed code that the homeowner can use to access the tamperproof sack system  100  anytime, and is distinct from the dynamically changing access code  360  that is sent to delivery people. 
     Then, to deliver a package, the delivery person looks up the access code  360  stored in his or her digital device  360  (the second digital communication device  360 ) and enters the access code  360  into the keypad  136 . In response to a valid access code  360  being input, the CPU  342  controls the locking mechanism  338  to unlock the shackle  132 . The delivery person then removes the lock  130  by pulling the shackle  132  out from the two loops  110   c  (and optionally from the hole  115  in the flap fastener inserting portion  114 , if the flap fastener inserting portion  114  is being used as an additional security layer), opens the adjustable opening portion  106  of the tamperproof sack  102  using the drawstring  110 , and inserts the package into the body  104  of the tamperproof sack  102 . To lock the tamperproof sack  102  back up, the delivery person closes the adjustable opening portion  106  using the drawstring  110 , passes the shackle  132  back through the two loops  110   c  (and optionally the hole  115 ), and presses the loose end of shackle  132  down into a corresponding hole on the lock body  134  to lock the shackle  132  in place, thereby closing and locking the tamperproof sack  102 . The package is now safely delivered inside of the tamperproof sack  102  and is ready to be picked up by the homeowner. 
       FIG.  4 A  is a perspective view of a tamperproof sack system strapped to a door of a home, from the perspective of somebody standing outside of the home, according to another exemplary embodiment. The tamperproof sack system  400  shown in  FIG.  4 A  is similar to the tamperproof sack system  100  shown in  FIG.  1 A , except that the tamperproof sack system  400  includes a zipper  440  provided on the front side  104   e  of the tamperproof sack  402 , and does not include the adjustable opening portion  106 . 
     More specifically, the tamperproof sack system  400  includes a tamperproof sack  402 , a door strap  418 , and a lock  430 . The tamperproof sack  402  includes a body  404  including a bottom side  404   a , a top side  404   b  opposite the bottom side  404   a , a left side  404   c  that is substantially perpendicular to the bottom side  404   a , a right side  404   d  that is substantially parallel to the left side  404   c , a front side  404   e  (i.e., the side facing out in  FIG.  4 A ), a rear side  404   f  opposite the front side (the read side facing in and contacting the door  101 ), a flap  412 , a flap fastener inserting portion  414  attached to an end of the flap  112 , and a flap fastener receiving portion  416  which is fixed to the front side  104   e . Unlike the exemplary embodiment in  FIG.  1 A , the top side  404   b  in the exemplary embodiment shown in  FIGS.  4 A and  4 B  does not have the adjustable opening portion  106 . The flap fastener inserting portion  414  and the flap fastener receiving portion  416  may collectively be referred to as the “flap fastener”. A hole  415  may be formed in the flap fastener inserting portion  414 . The lock  430  includes a shackle  432 , a lock body  434 , and a keypad  436 . Each of the components including the tamperproof sack  402 , door strap  418 , and lock  430  described above may have the same structure and functionality as the tamperproof sack  102 , door strap  118 , and lock  430  described with respect to  FIG.  1 A , respectively. 
     As shown in  FIG.  4 B , the tamperproof sack  402  further includes a zipper  440  and a track  442 . The zipper  440  includes a zipper pull  440   a , a zipper pull hole  440   b , and a slider  440   c . The track  442  includes a series of protrusions on the left and right sides (also known as “teeth”), which are arranged such that each tooth on the left side of the track  442  fits into the gap between two adjacent teeth on the right side of the track  442 , and each tooth on the right side of the track  442  fits into the gap between two adjacent teeth on the left side of the track  442 , in an interlocking fashion. The slider  440   c  is connected to the track  442  and is configured to slide up the track  442  to thereby interlock together the two opposing strips of teeth together, and is configured to slide down the track  442  to unlock the two opposing strips of teeth. The zipper pull  440   a  is connected to the slider  440   c  and is used to pull the slider  440   c  up and down the track  442 . Also, the zipper pull  440   a  includes a zipper pull hole  440   b  formed therein. The shackle  432  can pass through the zipper pull hole  440   b , to thereby lock the zipper  440  in place in a locked position. 
     The tamperproof sack  402  also includes a front side loop  444  and a back side loop  446  which are fixed in place. The front side loop  444  is formed on a front portion of the top side  404   b , and the rear side loop  446  is formed on a rear portion of the top side  404   b . When the zipper  440  is zipped up, the shackle  432  can pass through each of the front side loop  444 , the rear side loop  446 , and the zipper pull hole  440   c , thereby fixing the zipper  440  into a closed portion. Unlike the exemplary embodiment shown in  FIG.  1 A , the exemplary embodiment shown in  FIGS.  4 A and  4 B  does not include the drawstring  110  or the adjustable opening portion  106 . However, it is also possible to combine the exemplary embodiments shown in  FIG.  1 A  and  FIG.  4 A  to add a drawstring  106  in the top portion  404   b  of the tamperproof sack  402 , if desired. Also, although  FIG.  4 B  illustrates two loops  444  and  446 , it is also possible to use only one loop, or use three or more loops. 
     The tamperproof sack system  400  is especially useful for handling larger package deliveries, since the zipper  400  allows the entire front side  404   e  of the tamperproof sack  402  to be unzipped. 
       FIG.  5    is a close-up view of a modified version of the tamperproof sack system of  FIG.  4 A , according to yet another exemplary embodiment. The tamperproof sack system  500  of  FIG.  5    is substantially similar to the tamperproof sack system  400  of  FIGS.  4 A and  4 B , except that, in the tamperproof sack system  500 , the flap  412  is used to secure the tamperproof sack system  500  closed. Specifically, as shown in the left-hand side of  FIG.  5   , when the zipper  440  is zipped up to a closed position, a zipper flap  502  can be folded over to cover the zipper  440 . The zipper flap  502  can be fastened shut with snaps  504  (or some other fastening mechanism, such as Velcro, etc.). As shown in the right-hand side of  FIG.  5   , once the zipper  440  is securely covered with the zipper flap  502 , the flap  412  can be folded over the top of the tamperproof sack  502  and fastened closed using the flap fastener (i.e., the flap fastener inserting portion  414  and the flap fastener receiving portion  416 ). 
     In the modified version shown in  FIG.  5   , the front side loop  544  is located lower down on the front side of the tamperproof sack  502  than the front side loop  444  ( FIG.  4 B ), because in the modified version shown in  FIG.  5   , since the zipper  440  is covered under the zipper flap  502 , the zipper hole  440   c  is not used to help secure the shackle  432 . Thus, the front side loop  544  is located lower down on the front side of the tamperproof sack, and a rear side loop  546  is fixed on the flap  412 , so that the front side loop  544  and the rear side loop  546  can be locked together and thereby lock the flap  412  in place to cover the zipper and thus prevent access to the zipper, as shown on the right-hand side of  FIG.  5   . 
       FIGS.  6 A,  6 B,  6 C, and  6 D  illustrate a method of delivering a package to a home using the tamperproof sack system according to an exemplary embodiment. In  FIGS.  6 A- 6 D , the tamperproof sack system  100  is shown for illustrative purposes. However, the method shown in  FIGS.  6 A- 6 D  can also be used with other tamperproof sack systems, such as tamperproof sack system  400  ( FIG.  4 A ), tamperproof sack system  500  ( FIG.  5   ), or some other modified version of the tamperproof sack systems according to exemplary embodiments. 
     In operation  610  shown in  FIG.  6 A , a delivery person  600  delivering a package receives a new access code  360 . The delivery person  600  receives the new access code  360  that is transmitted from the homeowner&#39;s digital communication device  350  (the first digital communication device  350 ) to the delivery person&#39;s digital communication device  352  (the second digital communications device  352 ). The access code  360  can be transmitted according to various criteria and using various techniques. For example, the access code  360  can be directly transmitted to the delivery person&#39;s digital communications device  352  in response to a request from the delivery person, can be transmitted automatically to the delivery person at a certain time of day, can be transmitted automatically to the delivery person based on proximity (e.g., when the delivery person gets within a certain radius of the homeowner&#39;s digital communication device  350 ), or based on some other criteria. As another alternative, the sensors  346  and/or camera  348  can be used to sense or detect when the delivery person  600  arrives, and the access code  360  can be transmitted in response to sensing or detecting the arrival. Also, the access code  360  can be indirectly transmitted to the delivery person&#39;s digital communications device  360  through an intermediate node or network. For example, the access code  360  can be transmitted to the delivery company (e.g., AMAZON®) and stored by the delivery company, and then transmitted from the delivery company to the delivery person  600  at an appropriate time. 
     In operation  620  shown in  FIG.  6 B , the delivery person  600  unlocks the tamperproof sack system  100  using the access code  360  and inserts the package  602  into the tamperproof sack  102 . For example, the delivery person  600  can enter the access code  360  into the keypad  136 , to thereby cause the locking mechanism  338  to unlock one end of the shackle  132 . The delivery person  600  then removes the shackle  132  and opens the adjustable opening portion  106 , e.g., by loosening the drawstring  110 . The delivery person  600  then slides the package  602  into the tamperproof sack  102 . 
     In operation  630  shown in  FIG.  6 C , the delivery person  600  locks the tamperproof sack  102  back up by tightening the adjustable opening portion  106  (e.g., by tightening the drawstring  110 ), passing the loose end of the shackle  132  back through the loops  110   c  of the drawstring  110 , and pressing the loose end of the shackle  132  into the lock body  134  to lock the tamperproof sack  102 . The delivery person  600  then leaves the premises. 
     In operation  640  shown in  FIG.  6 D , the homeowner  604  arrives home and unlocks the tamperproof sack  102  to thereby take possession of the package  602 . The homeowner  604  can use the same access code  360  transmitted to the delivery person  600 , or can use some other access code (e.g., a “master” access code). Moreover, if the homeowner  604  desires, the homeowner  604  can unfasten the entire temporary sack  102  from the door  101  by unfastening the door strap fastener  122 , and can then store the temporary sack  102  for later use. 
     Another embodiment of the present disclosure is illustrated in  FIGS.  7 A and  7 B .  FIGS.  7 A and  7 B  illustrate an embodiment in which a closing mechanism, in this case a lock  701 , is part of a zip tie used to secure the tamperproof sack  702 . In this embodiment, the tamperproof sack is secured to a door  703  using the lock  701 . The zip tie  701  is pulled tightly enough that the opening  704  of the tamperproof sack cannot fit through the zip tie until it is unlocked. In this embodiment, the tamperproof sack may be unlocked by a user who knows how to unlock the lock  701  (in the illustrated embodiment, the user will know the combination to the lock), the opening  704  may be opened and filled with the desired item, the opening  704  may then be closed using the drawstring  705 , and the lock  701  may be placed as shown, preventing the tamperproof sack  702  from being opened or removed from the door  703  until another authorized user removes the lock  701 . 
       FIGS.  8 A,  8 B, and  8 C  illustrate an embodiment of the tamperproof sack  801  without a strap or a lock, although it is envisioned that a strap or a lock may be added in certain embodiments. In  FIG.  8 A , the tamperproof sack is shown with a closed end  802  and an open end  803 . A drawstring  804  is shown at open end  803  and is attached around the periphery of open end  803  so as to provide for the closing of open end  803  when the drawstring  804  is tightened. Closed end  802  may be formed by virtue of any method known in the art or disclosed herein. For example, closed end  802  may be formed by virtue of folding a single piece of material such that sides  805  are sealed together and open end  803  is thereby formed. The methods by which sides  805  may be sealed in such an embodiment are not particularly limited, and may be those known in the art or disclosed herein. In another embodiment, closed end  802  may also be formed by providing a tubular material to form the tamperproof sack  801  and then sealing the closed end using a method disclosed herein or a method known in the art. Preferably, the method of sealing closed end  802  or sides  805  is a method that will not reduce the tamperproof nature of the tamperproof sack. A method of closing the open end  803  is not particularly limited as long as it does not reduce the tamperproof nature of the tamperproof sack. 
       FIG.  8 B  illustrates opening the open end  803 . In this embodiment, the drawstring  804  may be drawn closed after an object is placed inside the tamperproof sack, thereby closing open end  803  as illustrated in  FIG.  8 C .  FIG.  8 C  illustrates an embodiment in which the tamperproof sack is closed and partially folded over. 
     It should be noted that although some of the figures illustrate the tamperproof sack including a drawstring, the tamperproof sack does not need to include a drawstring and in some embodiments does not include a drawstring. The tamperproof sack may be closed using any method known in the art or disclosed herein. 
     The material from which the tamperproof sack may be made has been described previously. In certain preferred embodiments, the material may be UHMWPE having a molecular weight as discussed above, and providing a level of protection of ANSI-A2 or above, in other embodiments is ANSI-A4 or above, and in other embodiments ANSI-A6 or above. The level of protection in terms of EN cut resistance is preferably EN-2 or above, in other embodiments EN-4 or above, and in other embodiments EN-5 or EN-6. 
     In certain embodiments, the tamperproof sack is made from a single unperforated piece of material. For example, the single unperforated piece of material may be a tube. The cross-sectional shape of the tube is not particularly limited, and may be circular, oval, rectangular, or the like. The tube may be formed by weaving the material on a circular loom. The single unperforated material may also be a sheet in certain embodiments, where the sheet is later adhered to itself to form the tamperproof sack. 
     In other embodiments, the tamperproof sack is made from multiple pieces of material adhered to each other to form the tamperproof sack. For example 2, 3, 4, or more pieces of material may be adhered to each other so as to form the tamperproof sack. 
     In certain embodiments, it may be necessary to perforate the material to, for example, sew it to other materials or to itself. In instances where it is necessary to perforate the tamperproof sack, it is preferable that the perforations do not cause a structural weakness in the tamperproof sack that would permit someone to open the bag in an unauthorized manner (such as by cutting into it, tearing the tamperproof sack, or entering the tamperproof sack by any means other than the opening through which the interior of the bag is intended to be accessed). For example, if the material used to make the tamperproof sack is sewn at any point, it is preferable that the sewing is located on the interior of the bag so that it is not exposed to the outside world. Preferably, all perforations are located only on the interior of the tamperproof sack, and no perforations are located on the exterior of the tamperproof sack. 
     If the tamperproof sack contains stitching, the stitching may be made from any suitable material. However, it is preferred that the stitching is made from a material that is tamperproof. In certain embodiments, the stitching is made from the same material as the tamperproof sack. It is preferred that the stitching have an EN or ANSI cut rating at least as high as the material used to make the tamperproof sack. 
     The material used to make the tamperproof sack is preferably bonded to itself or other materials using non-perforating methods, such as adhesives, zip ties of various materials (including metal and those made from the same material as the tamperproof sack), clamps, tapes, heat sealing, lamination, or other known methods. In one embodiment, any non-perforating means of sealing the tamperproof sack is located only on the interior of the tamperproof sack, and no non-perforating means of sealing the tamperproof sack are located on the exterior of the tamperproof sack. In another embodiment, a non-perforating means of sealing at least one end of the tamperproof sack comprises using a non-perforating method (such as a zip tie or heat seal) to bind one end of a tube of material, where the material is then flipped outside-in such that the sealing means is located on the interior of the tamperproof sack, thus forming a closed end of the tamperproof sack. 
     In certain embodiments, the tamperproof sack is stitch-free. In other embodiments, the tamperproof bag does not have any perforations. In still other embodiments, the tamperproof bag contains no holes or perforations on its exterior. 
     The size of the tamperproof sack is not particularly limited, and may be dictated by the size of the items that one desires to keep inside of it. Where the tamperproof sack is shaped like a tube, the tube may be, for example, from 0.1-6 feet long. However, for uses that are larger, the tube may be anywhere from 1-60 feet or longer. The diameter of the tube is also not particularly limited, and may be, for example, anywhere from 0.1 feet to 20 feet or more. For example, if the tamperproof sack were to be used to protect a load on a semitruck, the tamperproof sack could be 10-60 feet long and 3-12 feet or more in diameter. 
     In certain embodiments, the tamperproof sack may be envisioned as having a closed end and an open end. The closed end may be referred to as the bottom of the tamperproof sack, and the open end may be referred to as the opening or the top of the tamperproof sack. The closed end is sealed as discussed herein, and materials to be stored in the tamperproof sack enter and exit the tamperproof sack through the opening. 
     In one embodiment, the opening of the tamperproof sack is closed using a drawstring held in place at the top, or opening, of the tamperproof sack. The drawstring may be kept in place by a perforating method or a non-perforating method such as those listed above. In certain embodiments, the drawstring is kept in place by a sleeve stitched around the opening of the tamperproof sack. In other embodiments, the drawstring is kept in place by a sleeve formed around the opening of the tamperproof sack via heat sealing or an adhesive. 
     In certain embodiments, the tamperproof sack may be locked in a closed position by using a clamp to keep the opening of the tamperproof bag closed. The clamp may be locked in a closed position using a suitable lock, for example one of the locks disclosed herein. The clamp in certain embodiments may be integrally formed with the lock. 
     In certain embodiments, the tamperproof sack may be locked in a closed position by using a zip tie to keep the opening of the tamperproof bag closed. The zip tie may be locked in a closed position using a suitable lock, for example one of the locks disclosed herein. The zip tie in certain embodiments may be integrally formed with the lock. 
     In certain embodiments, the lock may be integrally formed with either the strap or the tamperproof sack. 
     The material that may be protected or stored in the tamperproof sack is not particularly limited and may include packages and other items that may be sent via mail. In other embodiments, the material that may be protected or stored in the tamperproof sack may be material that is abrasive or sharp, where the tamperproof bag provides protection to the user. Such material may include medical products (such as needles and the like), bulk cargo, plastic pellets, metal, glass, scrap, waste, and the like. In other embodiments, the material that may be protected or stored in the tamperproof sack may be a commodity, such as corn or wheat. 
     In certain embodiments, the tamperproof sack may be used as a method to transport cargo. For example, a large filled tamperproof sack may be transported via truck or ship. 
     The present disclosure also relates to methods of preventing the unauthorized removal of items from the tamperproof sack. Such methods may include the steps of filling the tamperproof sack as noted above and securing the tamperproof sack to a fixed object as noted above. The step of securing the tamperproof sack to a fixed object may include the use of a lock and locking the tamperproof sack to a fixed object. The method may further include informing an authorized user of a method by which to un-secure or open the tamperproof sack from the fixed object, and the subsequent un-securing of the tamperproof sack from the fixed object or opening of the tamperproof sack by the authorized user. The step of informing the authorized user of the method by which to un-secure or open the tamperproof sack from the fixed object is not particularly limited and may be any method known in the art, including but not limited to verbally or non-verbally (such as via an electronic communication) informing the authorized user of a combination to the lock. 
     The present disclosure also relates to a method of delivering objects, where the method includes an authorized user opening the tamperproof sack, inserting an object into the tamperproof sack, and then closing the tamperproof sack. The tamperproof sack prior to the delivery may or may not be secured to a fixed object. In instances where the tamperproof sack is secured to a fixed object prior to delivery, the step of opening the tamperproof sack may not require the tamperproof sack to be un-secured from the fixed object. In instances where the tamperproof sack is not secured to a fixed object prior to delivery, the authorized user may then secure the tamperproof sack to a fixed object either before or after inserting the object into the tamperproof sack. The step of closing the tamperproof sack may include a step of locking the tamperproof sack or another method as disclosed herein. 
     The present disclosure also relates to a method of secure transportation of an object from a first location to a second location. The method may include inserting an object into a tamperproof sack at a first location, closing the tamperproof sack such that only an authorized user may open it, and then transporting it to a second location. In alternative embodiments, the closing of the tamperproof sack may occur at the second location. The tamperproof sack may then be secured to a fixed object at the second location such that an authorized user could open or un-secure the tamperproof sack at the second location. In certain embodiments, an authorized user at a second location may open the tamperproof bag and remove the object from the tamperproof bag. 
     The method of secure transportation of an object from a first location to a second location may also include one or more of the steps and methods disclosed above relating to a method of delivering objects and/or preventing the unauthorized removal of items from the tamperproof sack. 
     As used herein, an authorized user is a person or entity that has permission from the owner or originator of the tamperproof sack to open, close, or otherwise use as described herein the tamperproof sack. The authorized user in most instances will be informed of a method by which to open or close the tamperproof sack without cutting or otherwise damaging the tamperproof sack. This information may be provided by the owner of the tamperproof sack or another person or entity permitted by the owner. For example, if the tamperproof sack is used to receive packages from a certain company, for example, Amazon®, the authorized user may be an Amazon® delivery person who has received instructions on how to open the tamperproof sack from either Amazon® (at the permission of the owner of the tamperproof sack) or the owner of the tamperproof sack, so as to deliver a package into the tamperproof sack. A second, usually different, authorized user may then open the tamperproof package after delivery so as to retrieve the delivered object. 
     It should be understood that the exemplary embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each exemplary embodiment should typically be considered as available for other similar features or aspects in other exemplary embodiments. For example, the drawstring  110  shown in  FIG.  2 A  can also be used in the tamperproof sack system  400  ( FIG.  4 A ) or the tamperproof sack system  500  ( FIG.  5   ). Also, although  FIG.  4 A  illustrates a single zipper  440 , multiple zippers can be used in various configurations. Moreover, although the exemplary embodiments shown in  FIGS.  1 A,  1 B, and  4 A  illustrate the temporary sack systems as being fastened to a door  101 , the temporary sack systems can also be fastened to other objects as well, e.g., windows, trees, fences, etc. Also, according to certain exemplary embodiments, it may be desirable to fasten the tamperproof sack system  100  to a fixture or anchored object located outside (e.g., a tree), in which case the strap fastener  122  can be modified so that the strap fastener is also locked by the lock  130 . For example, the strap fastener  122  may have holes formed therein through which the shackle  132  can pass, or may have separate attachment devices that can be locked in place by the shackle  132 . As a result, the entire tamperproof sack system  100  can be safely and securely left outside. 
     While one or more exemplary embodiments have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope as defined by the following claims.