Description: Durable Quality - Constructed from ECT-32 corrugated material, these cardboard boxes are designed for standard strength industrial use. The boxes can hold up to 65 lbs and 32 lb edge crush tested, certified and tested to meet all single wall box storage, mailing, and shipping requirements. These are perfect to use as shipping boxes, moving boxes, or for storage. Shipping Box Size - The extra large size of 20" x 20" x 15" makes these boxes versatile for packing, moving, or shipping various items. They can be used as packing boxes for moving medium and large items.