Heavy duty construction provides greater protection and stacking strength. Cartons are sold in bundle quantities and ship flat to save on storage space and shipping. 275# Double-wall/ECT-48 (Edge Crush Test) - holds up to 100 lbs. Heavy-Duty boxes provide added protection to ensure that your shipments arrive safe. Meets most mailing and shipping carrier specifications. Contains a minimum of 30% recycled content. Staples Brand 100% Satisfaction Guaranteed. Dimensions: 18''L 18''W 24''H. Capacity: 4. 5 cubic feet. Sold as a 10/Bundle. Twice the protection of a standard carton.