Heavy Duty Boxes

Heavy-Duty Pallet & Shipping Boxes Use heavy-duty boxes when you need extra stacking strength. Single Wall Heavy-Duty Boxes & Super Shippers are made from strong 275#/ECT-44 corrugated. Double Wall Heavy-Duty Boxes are made from strong 275# D.W./ECT-48 corrugated. Super-Shippers are scored at multiple depths - simply cut down to desired size.