Media mail is a cost effective way to send media and other educational materials. By this definition, vinyl records are indeed included in this bracket and are in fact welcomed. The United States Postal Service defines it as thus: 'Available for sending small and large packages containing books, film, manuscripts, sound recordings, video tapes, and computer media (such as CDs, DVDs, and diskettes) only. Media Mail cannot contain advertising. Books shipping as Media Mail may contain incidental book announcements.'