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

Containers2-2.2.22 Containers2-1 GeneralSeveral types of containers are acceptable for mailing items if the containersand items are prepared within the standards of this publication. The principaltypes of mailing containers include the following:Bags, bales, bundles,films, and wraps.Boxes.Cans and drums.Envelopes.Tubes.2-2 Bags, Bales, Bundles, Films, and Wraps2-2.1 UseBags, bales, bundles, films, and wraps are acceptable for mailing certaineasy loads and average loads. The contents in these containers should becompressed when possible. The Postal Service does not accept suchcontainers for the mailing of difficult loads.2-2.2 Paper Bags and Wraps2-2.2.1 Easy Load up to 5 PoundsA paper bag or paper wrap is acceptable. The paper must be of at least50-pound basis weight — the strength of a regular large grocery sack. Thecontents must be immune from impact or pressure damage. The combining(layering) of several sheets that add up to or exceed a 50-pound basis weightis not acceptable.2-2.2.2 Easy or Average Load up to 20 PoundsA reinforced bag or a bag of at least 70-pound basis weight is acceptable. Anonreinforced loose-fill padded bag is not acceptable as an exterior containerunless the exterior layer is of at least 60-pound basis weight.Publication 2, January 20027