Abstract: A kit of parts constructed for ready assembly into a box and comprising a blank consisting of at least three juxtaposed side panels, a covering for each of the side panels, and end panels formed with projections and recesses for engagement with corresponding recesses and projections, respectively, on the side panels; wherein the covering is made of a repeatedly deformable elastomeric or sheet metal material, and each side panel, where adjacent to another side panel, is provided with projections and recesses which interlock with similar projections and recesses on the adjacent side panel. The kit is adapted to be assembled into box form by successive folding of the side panels into engagement with the end panels.