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A bag comprises an upper chamber and a lower chamber. The upper chamber comprises an inlet end defining an inlet opening. The lower chamber defines a lower chamber interior volume less than the upper chamber interior volume. A strainer is between the bottom end of the upper chamber and the top end o

A bag comprises an upper chamber and a lower chamber. The upper chamber comprises an inlet end defining an inlet opening. The lower chamber defines a lower chamber interior volume less than the upper chamber interior volume. A strainer is between the bottom end of the upper chamber and the top end of the lower chamber. The strainer places the upper chamber interior volume in fluid communication with the lower chamber interior volume. The bag wall may define an outlet port. A filter patch may be attached to the bag wall to cover the outlet port. The filter patch may be adapted to entrap airborne particles having a diameter of one micron or greater carried by air passing from the bag interior volume through the filter patch. The bag may be useful in enhancing the detectability of and in reducing the exposure to contaminants that may be present in mail deposited in the bags.

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1. A bag comprising:an upper chamber defining an upper chamber interior volume, the upper chamber comprising: an inlet end of the upper chamber defining an inlet opening; and a bottom end of the upper chamber opposite the inlet end of the upper chamber; a lower chamber defining a lower chamber inter

1. A bag comprising:an upper chamber defining an upper chamber interior volume, the upper chamber comprising: an inlet end of the upper chamber defining an inlet opening; and a bottom end of the upper chamber opposite the inlet end of the upper chamber; a lower chamber defining a lower chamber interior volume less than the upper chamber interior volume, the lower chamber comprising: a top end of the lower chamber; and a bottom end of the lower chamber opposite the top of the lower chamber; and a strainer between the bottom end of the upper chamber and the top end of the lower chamber placing the upper chamber interior volume fluid communication with the lower chamber interior volume; wherein: a chamber selected from the upper and lower chambers defines an outlet port; and the bag further comprises a filter patch attached to the selected chamber and covering the outlet port; and the filter patch is adapted to entrap airborne particles having a diameter of one micron or greater carried by air passing from the selected chamber interior volume through the filter patch. 2. The bag of claim 1 further comprising front and rear sheets in opposed arrangement, wherein the strainer comprises select portions of the front sheet and the rear sheet intermittently sealed to each other to define a plurality of strainer openings placing the upper chamber interior volume in fluid communication with the lower chamber interior volume.3. The bag of claim 1 wherein:the lower chamber defines an outlet port; the bag further comprises a filter patch attached to the lower chamber covering the outlet port; and the filter patch is adapted to entrap airborne particles that may be carried by the air passing from the lower chamber interior volume through the filter patch. 4. The bag of claim 3 wherein the filter patch is adapted to entrap airborne particles having a diameter of one micron.5. The bag of claim 1 wherein the filter patch comprises a filter medium selected from HEPA (high efficiency particle air) filter material and ULPA (ultra low penetration air) filter material.6. The bag of claim 1 wherein:the filter patch is removeably attached to the selected chamber; the bag further comprises a resealing patch proximate the filter patch and adapted to cover the outlet port after the filter patch is removed from covering the outlet port. 7. The bag of claim 6 wherein the filter patch is adapted to entrap airborne particles having a diameter of one micron.8. The bag of claim 1 wherein the upper chamber comprises front and rear opposing walls and further comprising an adhesive on at least a portion of the front wall.9. The bag of claim 8 wherein the front and rear walls have inside surfaces facing each other and the adhesive is on the inside surface of the front wall.10. The bag of claim 1 wherein the upper and lower chambers comprise one or more thermoplastic polymers.11. The bag of claim 1 whereinthe bag further comprises a covering over the outlet port and removeably attached to the selected chamber. 12. The bag of claim 1 wherein the filter patch is adapted to entrap airborne particles having a diameter of one micron.13. A bag comprising:an upper chamber defining an upper chamber interior volume, the upper chamber comprising: an inlet end of the upper chamber defining an inlet opening; and a bottom end of the upper chamber opposite the inlet end of the upper chamber; a lower chamber defining a lower chamber interior volume less than the upper chamber interior volume, the lower chamber comprising: a top end of the lower chamber; and a bottom end of the lower chamber opposite the top of the lower chamber; a strainer between the bottom end of the upper chamber and the top end of the lower chamber placing the upper chamber interior volume in fluid communication with the lower chamber interior volume; and a specimen strip thin the lower am interior volume, the specimen strip being adapted to entrap airborne articles having a diameter of one micron or greater that may encounter the specimen strip. 14. The bag of claim 13 wherein the strainer connects the bottom of the upper chamber to the top of the lower chamber.15. The bag of claim 13 wherein the specimen strip comprises a material selected from an adhesive, an adhesive-coated film, a porous film, a fibrous film, and a spun-woven material.16. The bag of claim 13 wherein the upper and lower chambers comprise one or more cross-linked thermoplastic films.17. The bag of claim 16 wherein the one or more thermoplastic films have a free heat shrink of at least about 5% in at least two directions, measured according to ASTM D2732 using 10 cm by 10 cm samples at 185° F.18. The bag of claim 13 wherein the specimen strip is adapted to entrap airborne particles having a diameter of one micron.19. A bag comprising:an upper chamber defining an upper chamber interior volume, the upper chamber comprising: an inlet end of the upper chamber defining an inlet opening; and a bottom end of the upper chamber opposite the inlet end of the upper chamber; a lower chamber defining a lower chamber interior volume less than the upper chamber interior volume, the lower chamber comprising: a top end of the lower chamber; and a bottom of the lower chamber opposite the top of the lower chamber; a strainer between the bottom end of the upper chamber and the top end of the lower chamber placing the upper chamber interior volume in fluid communication with the lower chamber interior volume, wherein the inlet end of the upper chamber further defines one or more receiving openings. 20. A bag comprising:an upper chamber defining an upper chamber interior volume, the upper chamber comprising: an inlet end of the upper chamber defining an inlet opening; and a bottom end of the upper chamber opposite the inlet end of the upper chamber; a lower chamber defining a lower chamber interior volume less than the upper chamber interior volume, the lower chamber comprising: a top end of the lower chamber; and a bottom end of the lower chamber opposite the top of the lower chamber; a strainer between the bottom end of the upper chamber and the top end of the lower chamber placing the upper chamber interior volume in fluid communication with the lower chamber interior volume, wherein; the inlet end of the upper chamber comprises at least one foldable closure flap moveable between a closed position, in which the closure flap covers the inlet opening, and an open position, in which the closure flap is positioned to allow access through the inlet opening to the upper chamber interior volume; and the closure flap is heat sealed to the upper chamber in the closed position. 21. A bag comprising:an upper chamber defining an upper chamber interior volume, the upper chamber comprising: an inlet end of the upper chamber defining an inlet opening; and a bottom end of the upper chamber opposite the inlet end of the upper chamber; a lower chamber defining a lower chamber interior volume less than the upper chamber interior volume, the lower chamber comprising: a top of the lower chamber; and a bottom end of the lower chamber opposite the top of the lower chamber; and a strainer between the bottom end of the upper chamber and the top end of the lower chamber placing the upper chamber interior volume in fluid communication with the lower chamber interior volume, wherein: the upper chamber comprises front and rear opposing walls and further comprises an adhesive on at least a portion of the front wall; the front and rear walls have inside surfaces facing each other and opposing outside surfaces; and the adhesive is on the outside surface of the front wall. 22. A bag comprising:an upper chamber defining an upper chamber interior volume, the upper chamber comprising: an inlet end of the upper chamber defining an inlet opening; and a bottom end of the upper chamber opposite the inlet end of the upper chamber; a lower chamber defining a lower chamber interior volume less than the upper chamber interior volume, the lower chamber comprising: a top end of the lower chamber; and a bottom end of the lower chamber opposite the top of the lower chamber; a strainer between the bottom end of the upper chamber and the top end of the lower chamber placing the upper chamber interior volume in fluid communication with the lower chamber interior volume, wherein the upper chamber comprises front and rear opposing walls and further comprises an adhesive on at least a portion of the front wall; and a resilient material adjacent one or more selected regions of the adhesive, wherein the resilient material in a non-compressed state extends above the surface of the adhesive and is adapted to compress upon application of a selected force to allow the adhesive to contact the rear wall, whereby the resilient material deters premature adhesion of the adhesive to the rear wall before application of the selected force. 23. The bag of claim 22 wherein the resilient material comprises foam.24. A bag comprising:an upper chamber defining an upper chamber interior volume, the upper chamber comprising: an inlet end of the upper chamber defining an inlet opening; and a bottom end of the upper chamber opposite the inlet end of the upper chamber; a lower chamber defining a lower chamber interior volume less than the upper chamber interior volume, the lower chamber comprising: a top end of the lower chamber; and a bottom end of the lower chamber opposite the top of the lower chamber; and a strainer between the bottom end of the upper chamber and the top end of the lower chamber placing the upper chamber interior volume in fluid communication with the lower chamber interior volume, wherein: the upper chamber comprises front and rear opposing walls and further comprises an adhesive on at least a portion of the front wall; the adhesive is applied within a selected adhesion area of the front wall; and the bag further comprises resilient material applied in a plurality of selected zones within the adhesion area of the front wall, wherein the resilient material is adapted to: deter premature adhesion of the adhesive to another surface before application of a selected force to compress the resilient material; and allow the adhesive to contact and adhere to another surface upon application of the selected force. 25. A bag comprising:an upper chamber defining an upper chamber interior volume, the upper chamber comprising: an inlet end of the upper chamber defining an inlet opening; and a bottom end of the upper chamber opposite the inlet end of the upper chamber; a lower chamber defining a lower chamber interior volume less than the upper chamber interior volume, the lower chamber comprising: a top end of the lower chamber; and a bottom end of the lower chamber opposite the top of the lower chamber; a strainer between the bottom end of the upper chamber and the top end of the lower chamber placing the upper chamber interior volume in fluid communication with the lower chamber interior volume; and a funnel attached to the upper chamber, the funnel having a relatively large funnel inlet end and a relatively small funnel outlet end, wherein: the funnel inlet end is substantially coextensive with the inlet opening of the upper chamber; and the funnel owlet end is within the upper chamber interior volume. 26. The bag of claim 25 wherein the funnel comprises a material selected from a fibrous material, an open-celled material, and a spun-woven material.27. A bag comprising:an upper chamber defining an upper chamber interior volume, the upper chamber comprising: an inlet end of the upper chamber defining an inlet opening; and a bottom end of the upper chamber opposite the inlet end of the upper chamber; a lower chamber defining a lower chamber interior volume less than the upper chamber interior volume, the lower chamber comprising: a top end of the lower chamber; and a bottom end of the lower chamber opposite the top of the lower chamber; and a strainer between the bottom end of the upper chamber and the top end of the lower chamber placing the upper chamber interior volume in fluid communication with the lower chamber interior volume; wherein: the lower chamber comprises front and rear opposing walls having inside surfaces facing each other and opposing outside surfaces, and further comprising an adhesive on at least a portion of the outside surface of the front wall. 28. The bag of claim 27 wherein:the front wall of the lower chamber defines one or more lines of opening adapted to facilitate opening the lower chamber along the lines of opening; the adhesive is proximate the one or more lines of opening; and at least a portion of the lower chamber is adapted to be folded over and adhered to the adhesive to reclose the lower chamber after the lower chamber has been opened along the lines of opening. 29. A bag defining an interior volume and an inlet opening, the bag comprising:a bag wall defining outlet port; and a filter patch attached to the bag wall and covering the outlet port, wherein the filter patch is adapted to entrap airborne particles having a diameter of one micron or greater carried by air passing from the bag interior volume through the filter patch; wherein: the filter patch is removeably attached to the bag wall; and the bag further comprises a resealing patch proximate the filter patch and adapted to cover the outlet port after the filter patch is removed from covering the outlet port. 30. The bag of claim 29 wherein the filter patch comprises a filter medium selected from HEPA (high efficiency particle air) filter material and ULPA (ultra low penetration air) filter material.31. The bag of claim 29 wherein the filter patch is adapted to entrap airborne particles having a diameter of one micron.