Abstract: A container for holding data-storage devices of different sizes, e.g. disks of various sizes, cartridges and cassettes. The container is provided with a plurality of trays, preferably identical to each other, which rest on the container bottom, each tray having a platform for receiving and holding data-storage devices Each tray can be turned either side up in the container, and each has support members which are of different heights on its opposite sides so that the platform is positioned higher or lower in the container depending on which way it is turned. The trays are placed in the container in an orientation selected to support the particular size of storage devices to be placed in them; for taller storage devices, the tray is preferably turned so its platform is lower, and vice versa when shorter storage devices are to be stored, whereby the tops of storage devices of different sizes can be made to lie at about the same height for convenient viewing and grasping.