What is the weight limit for signed-for Library Mail?

The weight limit for signed-for Library Mail is indeed 15 lbs. This classification of mail is specifically designed for libraries and allows them to send their materials securely. The 15 lbs limit ensures that libraries can send a variety of items—such as books, periodicals, and audio-visual materials—while maintaining a manageable and efficient weight for mail handling and delivery services. This regulation helps to facilitate the movement of library materials between institutions while adhering to postal standards. Understanding these limits is crucial for libraries to optimize their shipping practices and ensure compliance with postal regulations.