Approximately 40% stronger than 200 lb test cartons! Ideal for heavy-duty applications. Constructed from extra-strong 275-lb D.W./ECT-48. Can hold up to 100 lb of contents. Greener choice - contains 15% total recycled content with 13% postconsumer recycled content. Office Depot (R) Brand Double-Wall Heavy-Duty Corrugated Cartons, 9in. x 9in. x 13in., Pack Of 25 is one of many Shipping Boxes available through Office Depot. Made by Office Depot.