A method of forming a box is discussed. A sheet of foldable material has a central region and tabs extending from the central region around its perimeter. Each tab includes a first fold line at the central region, and second and third spaced apart fold lines parallel to the first fold line. A reinforcement ring has a perimeter corresponding to the perimeter of the central region and a thickness greater than a thickness of the sheet. The reinforcement ring is disposed on the central region. Each tab is folded along the first fold line to extend transversely to the central region against the reinforcement ring, along the second fold line to extend inwardly over the reinforcement ring, and along the third fold line to extend transversely to the central region against the reinforcement ring. The tabs folded around the reinforcement ring define side wall(s) of the box.