GLOSSARY
Library Mail
By Justin Winter · Updated August 28, 2026
A discounted USPS mail class for books, sound recordings, and other materials shipped between schools, libraries, and similar qualifying institutions.
Library Mail offers rates similar to Media Mail but is restricted to loans and exchanges between libraries, schools, academic institutions, and a small set of other qualifying organizations — not to the general public shipping books to each other.
Like Media Mail, it is a rate class for physical media, not a class a document or letter can travel under.
See also
- Media Mail — A discounted USPS class for books and educational media only. Letters and correspondence are not eligible, and pieces may be inspected.
- Bound Printed Matter — A USPS mail class for advertising, promotional, or editorial material that is permanently bound — catalogs, manuals, directories — priced by weight rather than as a letter.
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