Abstract: A universal stackable locking container (10) comprising a plurality of independent trays (12), in which each tray (12) can store small articles therein. Each tray (12) includes a cylindrical side wall (14) having an open top (16) with an annular rim (18) thereabout, a disc-shaped bottom wall (20) and an upstanding central barrel (22) formed on the bottom wall (20). The barrel (22) has a finger hole (24) therethrough, so that a person can insert a finger into the finger hole (24) and grip the barrel (22) to lift and carry the tray (12). A structure (26) is in each tray (12), for stacking the trays (12) one upon the other. An assembly (28) is in each tray (12) for interlocking and unlocking the trays (12) when the trays (12) are stacked one upon the other. A cover (30) fits upon the uppermost tray (12). A facility (32) is in the cover (30), for interlocking and unlocking the cover (30) to the upper most tray (12).