Our shipping, mailing and packing boxes come in a variety of sizes to fit all your needs. The Seal-It large box 17.25 x 11.25 x 6 inches is great for mailing, shipping, storage and moving. The corrugated container board boxes are made of 100% post-consumer recycled content. The white boxes have been certified with durable 32 lb. edge crush test (ECT) rating, each box holds up to 65 lbs. and burst strength of 200 lbs. pressure per square inch minimum. This large box is ideal for books, packing kitchen items, dishes, fragile small items.