an improved shipping system includes a base deck section . the system further includes an upper - tier deck section , that moves between a position atop the base deck section through a variety of positions , including positions that put the upper section out of the way of loading and unloading any load on the base deck section . cartons may be atop both the base deck section and the upper - tier deck section , for shipments , with the upper - tier deck section in the raised configuration . when emptied , the shipping system may be returned with its upper - tier deck section moved down to a position atop the base deck section , and the shipping system stacked upon a similar improved shipping system . shipping efficiency is increased as much as twenty percent and perhaps more . all components are steel , and may also be plastic , wood and the like .