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Home > About USPS & News > Forms & Publications > Postal Periodicals and Publications > Publications > Publication 2 - Packaging for Mailing > 1 Packaging Adequacy
The information in this publication is primarily for companies and customers
who mail parcels and special items. For parcels to be accepted for mailing,
they must be prepared according to the requirements and guidelines in this
publication. More detailed packaging and mailability requirements are in
module C of the Domestic Mail Manual (DMM) and in the International Mail
Manual (IMM). Requirements specific to each class of mail are covered in
those manuals.
State and federal regulations also can affect the mailability of parcels
containing certain items such as hazardous, biological, and restricted
materials. The Postal Service accepts properly prepared and marked parcels,
but it reserves the right to refuse parcels that contain nonmailable items or
that seem improperly prepared.
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