What is the maximum weight for Library Mail?

The maximum weight for Library Mail is indeed 70 pounds. Library Mail is a special category of mail that allows for the shipment of books, sound recordings, and other educational materials at a discounted rate. This service is primarily aimed at schools, libraries, and other educational institutions. The weight limit of 70 pounds allows for the inclusion of multiple items or heavier materials in a single shipment, making it easier for libraries and educational institutions to send and receive large volumes of items. Choosing any other weight limit would not align with the established regulations set forth by the United States Postal Service for Library Mail, which is specifically defined as having a maximum weight allowance of 70 pounds.