Publication 2 - Packaging for Mailing - Postal Explorer - USPS.com

6-6.2.2 Bulk Mail Center Standards60-pound basis weight. Multiple tapes up to 5 pounds must be packed in anouter container of fiberboard or chipboard at least 22 mils thick.6-6.2.2 ClosingThe outer mailing container must be securely closed with tape, heat sealing,adhesive, completely clinched staples, or a multiple friction closure (two ormore flaps or tabs). Paper tape must be of at least 60-pound basis weightkraft. Shrinkwrap may be used on the outside of an otherwise properly closedbox. Reinforced tape is adequate both to close and reinforce the outercontainer.6-6.3 Magnetic Tapes From 5 to 10 Pounds6-6.3.1 PackingA mailing of tapes weighing from 5 to 10 pounds must be packed in an outercontainer of fiberboard or chipboard at least 22 mils thick. Tapes should bepacked in multiple shells for additional protection.6-6.3.2 ClosingThe outer mailing container must be securely closed with tape, adhesive, orcompletely clinched staples. Paper tape must be of at least 60-pound basisweight kraft. An otherwise properly closed box may be shrinkwrapped.Reinforced tape is adequate both to close and reinforce the outer container.Tapes should be packed in multiple shells for additional protection.6-6.4 Magnetic Tapes From 10 to 20 Pounds6-6.4.1 PackingA mailing of tapes weighing from 10 to 20 pounds must be packed in an outercontainer of fiberboard or chipboard at least 22 mils thick.6-6.4.2 ClosingThe outer mailing container must be securely closed with tape, adhesive, orcompletely clinched staples. Paper tape must be of at least 60-pound basisweight kraft. The container should be reinforced in a direction that providesthe most support with reinforced paper or plastic tape, pressure-sensitivefilament tape, or tight nonmetallic banding. Reinforced tape is adequate bothto close and reinforce the box. An otherwise properly closed box may beshrinkwrapped.6-6.5 Magnetic Tapes From 20 to 40 Pounds6-6.5.1 PackingA mailing of tapes weighing from 20 to 40 pounds must be packed in at leasta 175-pound test fiberboard box (or equivalent). Tapes should be packed inmultiple shells for additional protection.32 Publication 2, January 2002