a collapsible , reusable , general purpose shipping box is made from an inexpensive polymer composition , and can be mass produced by extrusion or coextrusion . the boxes are extruded or coextruded in an almost wasteless production as endless webs of inner layouts and outer layouts , which are folded into respective configurations with one of the configurations being outer one and another inner one . the enclosure is assembled by inserting the inner configuration into the outer one and snap - connecting the complementary male - female locking elements already extruded into the layouts . an extruded web may be many layouts wide as a given extruder and die allow . the boxes can be easily assembled from substantially flat and rectangular layouts at the point of packaging , either by hand or by using a slightly modified and currently widely used box erection machine , and as easily disassembled for transportation and cleansing at the point of unloading .