Twice the protection of a standard carton. 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. Overall Dimensions: 18" x 12" x 10". 48 ECT. Industry Standard Double Wall Corrugated. 15/Bundle. Double-wall boxes provide maximum stacking strength. 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. Sold as 15 pieces/Bundle.