Abstract: This invention relates to an improved telescopable cover for truck beds and the like characterized by a transversely-spaced pair of generally channel-shaped tracks opening toward one another and shaped to define a gutter in the bottom thereof alongside a slot separating upper and lower rail-forming surfaces. Mounted in these rails are a plurality of interlocking slot-forming panels, all but the lead panel of which has a downturned flange along its leading edge, a downwardly and rearwardly sloping cam surface adjacent the trailing edge thereof and an upturned flange along the trailing edge positioned and adapted to lock in behind the downturned flange on the leading edge of the panel therebehind so as to form a chain. A continuation of the lower rail slopes downwardly and forwardly to produce a ramp down which the panels slide and stack atop one another as they leave the confines of the upper rail, become separated and enter a storage area.