Abstract: A set of identical connectors are secured to a plurality of rectangular panels to form a tubular or box-like storage unit with the connectors forming parallel longitudinal edges thereof. The connectors each have a longitudinal T-shaped rib and a T-shaped, longitudinal recess, capable of slideably receiving the rib of an adjacent storage unit, so that a plurality of units may be arranged and stacked to form a self sustaining structure from which one or more storage units may be slideably removed without disturbance to the remaining structure and units. In one embodiment a connector and a panel are formed integrally as a one-piece unit.