Halverson says much of an engineered pallet's weight is in the blocks supporting the top and bottom layers. The APA is looking at using lighterweight material for the blocks, such as metal or extruded plastic, that would still maintain the pallet's compressive strength. One of its designs has hollow metal legs pressed into the pallet's top and bottom decks. It weighs 30-lbs. and can support 1,000 lbs.