Abstract: A foldable tray includes first and second base sections (BSs), lateral side members (LSMs) and a locking device. Each BS comprises opposed lateral edges, an inboard edge and a rigid hard surface. They are adjacent along their inboard edges, and foldable along those edges between an extended position where the hard surfaces lay in a plane and a folded position where the surfaces are stacked. The LSMs are attached along the opposed lateral edges of each of the BSs and foldable along that attached edge between an upright position where the LSM is at a substantial angle to the hard surface of its attached BS and a portable position where it is either stacked with its attached BS or has a major surface lying in the same plane as the hard surface of its attached BS. The locking device retains the BSs in the extended position only when engaged.