Pratt PRA0100 Recycled Corrugated Cardboard Double Wall Heavy Duty Printer's Box with BC Flute, 18" Length x 12" Width x 12" Height, (Pack of 15) 100 percent recycled corrugated box for packing, shipping, and storing 48 ECT grade for heavy-duty stacking performance Shaped to fit North American ledger or tabloid size and A3 size paper Made of double wall corrugated fiberboard (one C flute, one B flute) for extra protection of box contents Shipped flat to reduce shipping costs and storage space