These boxes are also known as foldable two-piece product boxes. The top and bottom telescopic box is pretty good for storing light things like clothes or foods. A design in a lid and a base is easy to fold together in order to create a rigid and solid structure for the box. They may be thinner than the rigid boxes, but their design means they easily ship flat and save on shipping costs. Their sturdy construction, along with lower-cost shipping, makes them just about the most ideal option for various lightweight products.