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A mail depository apparatus includes a rigid housing forming a channel adapted for directing deposited mail items and an interface member adapted to attach a flexible container to the housing for receiving deposited mail items from the channel, wherein the interface member is adapted to seal the fle

A mail depository apparatus includes a rigid housing forming a channel adapted for directing deposited mail items and an interface member adapted to attach a flexible container to the housing for receiving deposited mail items from the channel, wherein the interface member is adapted to seal the flexible container to the housing to substantially prevent escape of air from the flexible container and the housing at the interface member.

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What is claimed is: 1. A mail depository apparatus, comprising: a rigid housing forming a chamber adapted for directing deposited mail items; said housing including a housing opening, forming an exit from said chamber for deposited mail items, and a closure device located in proximity to said housi

What is claimed is: 1. A mail depository apparatus, comprising: a rigid housing forming a chamber adapted for directing deposited mail items; said housing including a housing opening, forming an exit from said chamber for deposited mail items, and a closure device located in proximity to said housing opening and adapted to isolate said housing opening from said chamber; a flexible container; an interface member adapted to attach said flexible container to said housing around said housing opening for receiving deposited mail items from said chamber; wherein said interface member is adapted to seal said flexible container to said housing to substantially prevent escape of air from said flexible container and said housing at said interface member; and wherein said interface member includes a peripheral surface adapted for contacting said housing around said housing opening, and wherein said interface member is adapted to pinch a peripheral edge of an opening of the flexible container between said peripheral surface and said housing around said housing opening. 2. The apparatus of claim 1, wherein said interface member includes a stiffening ring adapted to engage the peripheral edge of the opening of the flexible container. 3. The apparatus of claim 2, wherein said stiffening ring is sealed to said peripheral edge of said flexible container opening. 4. The apparatus of claim 2, wherein said stiffening ring is only stiff in a dimension perpendicular to an imaginary plane defined by said flexible container opening. 5. A mail depository apparatus, comprising: a rigid housing forming a chamber adapted for directing deposited mail items; said housing includes a housing opening forming an exit from said chamber for deposited mail items; a flexible container; an interface member adapted to attach said flexible container to said housing around said housing opening for receiving deposited mail items from said chamber; wherein said interface member is further adapted to seal said flexible container to said housing to substantially prevent escape of air from said flexible container and said housing at said interface member; wherein said interface member includes a peripheral surface adapted for contacting said housing around said housing opening; wherein said interface member is further adapted to pinch a peripheral edge of an opening of the flexible container between said peripheral surface and said housing around said housing opening; and wherein said interface member is adapted to be fixedly mounted to a structure, and further wherein said housing is adapted to be movably mounted to said structure to enable installation of the flexible container between said interface member and said housing by movement of said housing. 6. The apparatus of claim 5, wherein said interface member comprises a rigid ring. 7. A mail depository apparatus, comprising: a rigid housing forming a chamber adapted for directing deposited mail items; said housing includes a housing opening forming an exit from said chamber for deposited mail items; an interface member adapted to attach a flexible container to said housing around said housing opening for receiving deposited mail items from said chamber; wherein said interface member is further adapted to seal said flexible container to said housing to substantially prevent escape of air from said flexible container and said housing at said interface member; wherein said interface member includes a peripheral surface adapted for contacting said housing around said housing opening; wherein said interface member is further adapted to pinch a peripheral edge of an opening of the flexible container between said peripheral surface and said housing around said housing opening; and wherein said interface member is adapted to be fixedly mounted to a structure, and further wherein said housing is adapted to be movably mounted to said structure to enable installation of the flexible container between said interface member and said housing by movement of said housing, wherein said housing is hinged to said structure along an upper portion of said housing and adapted for upward rotation away from said fixedly mounted interface member. 8. The apparatus of claim 7, wherein said structure is a wall and said chamber is adapted for access through an opening in said wall. 9. A mail depository apparatus, comprising: a rigid housing forming a channel adapted for directing deposited mail items; a flexible container; and an interface member adapted to attach said flexible container to said housing for receiving deposited mail items from said channel, wherein said interface member is adapted to seal said flexible container to said housing to substantially prevent escape of air from said flexible container and said housing at said interface member, said interface member including a stiffening ring adapted to engage a peripheral edge of an opening of the flexible container, and wherein said interface member further comprises a collar adapted to pinch said stiffening ring and an engaged said peripheral edge. 10. A mail depository apparatus, comprising: a rigid housing forming a channel adapted for directing deposited mail items; and an interface member adapted to attach a flexible container to said housing for receiving deposited mail items from said channel, wherein said interface member is adapted to seal said flexible container to said housing to substantially prevent escape of air from said flexible container and said housing at said interface member, said interface member including a stiffening ring adapted to engage a peripheral edge of an opening of the flexible container, and wherein said interface member further comprises a collar adapted to pinch said stiffening ring and an engaged said peripheral edge, wherein said collar comprises a plurality of sides each having an inwardly facing channel adapted to receive said stiffening ring. 11. The apparatus of claim 10, wherein one of said sides is moveable to allow installation and removal from said collar of said stiffening ring and the flexible container. 12. The apparatus of claim 11, wherein said collar is adapted to squeeze a periphery of said stiffening ring when said ring is pressed into said collar by said one moveable side. 13. The apparatus of claim 12, wherein said collar is trapezoidal in shape, and further wherein said moveable side is longer than each of the remaining said sides which are fixed sides. 14. A mail depository apparatus, comprising: a rigid housing forming a channel adapted for directing deposited mail items; an interface member being adapted to attach a flexible container to said housing for receiving deposited mail items from said channel, said interface member being adapted to seal said flexible container to said housing to substantially prevent escape of air from said flexible container and said housing at said interface member; said flexible container having a single opening adapted to be substantially sealed to said housing by said interface member; and a cinching strap peripherally located around said flexible container in proximity to said single opening and adapted to constrict said flexible container and close said flexible container while said flexible container is sealed to said housing. 15. A method for collecting mail items in a flexible container, comprising the steps of: orienting a channel for directing deposited mail items to drop through a channel opening; sealing said flexible container around said channel opening with an interface member to contain mail items and to prevent escape of air from said flexible container and said channel at said interface member; closing said channel opening with a closure member to isolate said channel from said flexible container, and cinching said flexible container substantially closed with a cinch member in proximity to said channel opening while said flexible container is sealed around said channel opening. 16. A method for collecting mail items in a flexible container, comprising the steps of: orienting a channel for directing deposited mail items to drop through a channel opening; sealing said flexible container around said channel opening with an interface member to contain mail items and to prevent escape of air from said flexible container and said channel at said interface member; and closing said channel opening with a closure member to isolate said channel from said flexible container, wherein said step of sealing includes pinching a peripheral edge of an opening of said flexible container between said interface member and a housing forming at least a portion of said channel. 17. A flexible container for receiving deposited mail items, comprising: a flexible bag having an opening sized to fit around a rigid collar, said bag including a plurality of layers forming at least a portion of said bag; a cinch strap at least partially enclosed between said plurality of layers; and a stiffening ring adapted to engage said bag around said opening and to facilitate sealing said flexible bag to the collar; said flexible bag being adapted to be cinched closed in proximity to said stiffening ring while said bag is fitted to the collar, by said cinch strap being located a distance from said opening of said flexible bag. 18. The flexible container of claim 17, wherein said stiffening ring is sealed to said flexible bag at said opening. 19. The flexible container of claim 17, wherein said stiffening ring is adapted to be sealed to the collar. 20. The flexible container of claim 19, wherein said ring is stiff in two orthogonal dimensions parallel to an imaginary plane formed by said opening. 21. The flexible container of claim 19, wherein said ring is stiff in a dimension perpendicular to an imaginary plane formed by said opening. 22. A mail depository apparatus, comprising: a rigid housing forming a chamber adapted for directing deposited mail items; said housing including a housing opening forming an exit from said chamber for deposited mail items; a flexible container; an interface member adapted to attach the flexible container to said housing around said housing opening for receiving deposited mail items from said chamber; wherein said interface member includes a peripheral surface and is further adapted to pinch a peripheral edge of an opening of the flexible container between said peripheral surface and said housing around said housing opening; and wherein said interface member is adapted to be fixedly mounted to a structure, and further wherein said housing is adapted to be movably mounted to said structure to enable installation of the flexible container between said interface member and said housing by movement of said housing. 23. The apparatus of claim 22, wherein said peripheral surface is adapted for contacting said housing around said housing opening. 24. The apparatus of claim 22, wherein said interface member comprises a rigid ring. 25. A mail depository apparatus, comprising: a rigid housing forming a chamber adapted for directing deposited mail items; said housing including a housing opening forming an exit from said chamber for deposited mail items; an interface member adapted to attach a flexible container to said housing around said housing opening for receiving deposited mail items from said chamber; wherein said interface member includes a peripheral surface and is further adapted to pinch a peripheral edge of an opening of a flexible container between said peripheral surface and said housing around said housing opening; and wherein said interface member is adapted to be fixedly mounted to a structure, and further wherein said housing is adapted to be movably mounted to said structure to enable installation of the flexible container between said interface member and said housing by movement of said housing wherein said interface member comprises a rigid ring, wherein said housing is hinged to said structure along an upper portion of said housing and adapted for upward rotation away from said fixedly mounted interface member.