Abstract: A mailer for disks. The mailer has first and second pockets for receiving disks, each pocket formed of front and back rectangular panel members joined at at least one pair of corresponding edges and unconnected on at least one pair of corresponding edges. The pockets are foldably attached by a spine at an edge of each of said pockets. There is a sealing member for adhering the first pocket to the second pocket to maintain the mailer in a closed conformation. At any pocket edge not retaining the received disk by the joined edges, the spine, or the sealing member, the disk is retained in the pocket by retaining means.