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About Package Services

All of the following package service categories have strict and sometimes subtle rules. For the most up-to-date and complete domestic and international mailing information, see the USPS website, the USPS Postal Explorer website, or your USPS postal representative.

This US Postal Service category includes:

Retail Ground: Retail Ground (formerly known as Standard Post) is a general category that can be used for most items and merchandise.
Parcel Select Ground: Parcel Select Ground is similar to Retail Ground, except that Parcel Select Ground is available only as Internet Postage, offers 2-8 day delivery times, costs less than Retail Ground.
Media Mail: Media Mail is restricted to certain media types (books, videos, and so on).
Library Mail: Library Mail is restricted to library items being shipped to or from a library or school.

Note: USPS Tracking is included at no additional charge for all domestic package mail classes except Marketing Mail.