however it is understood that the benefits of the invention could be achieved without such inner wall or utilizing one of the other retaining methods disclosed herein in the alternative embodiment shown in fig1 the disc shaped media seats on the rim 28 as in the embodiment shown in fig3 b but the cover 14 x does not snap onto the base 12 but rather threadably engages it furthermore the bottom 12 x of the base 12 is flared outwardly and contains internal threads that are of the same dimension as the internal threads of the cover 14 x the cover 116 x includes mating external threads such that the cover 116 x can be threaded into the flared bottom 12 x of base 12 in this way the covers 14 x and 116 x can be removed from the base 12 and threadably engaged to form a mini packaging unit for the disc shaped media in the alternative embodiments of fig1 a and 12b the need to flare out the bottom of the base 12 is eliminated in fig1 a the base 12 y receives a bottom cover 116 y that includes an overlapping portion 117 y the outer surface 118 y of which is of equal dimension to the outer surface 118 y of which is of equal dimension to the outer wall of the base 12 y such that covers 14 y and 11 y can be slidably engaged to form a mini storage unit for the disc media in fig1 b the base 12 z has an external threaded portion 119 z and an internal threaded portion 120 z each of which extends beyond the.