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. Industry standard double wall corrugated. 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. Corrugated cartons are all 100% recyclable. Staples Brand 100% Satisfaction Guaranteed. Weight: 9.99.Heavy-Duty DesignStaples heavy-duty double-walled boxes have a design that makes them twice as strong as thinner single-walled boxes. This means you can add up to 100 pounds of items into each box without having to worry about the box stretching bending breaking or tearing in transit.Stackable BoxesThese stackable Staples heavy-duty double-walled boxes are ideal for storage spaces or for moving in a van or