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. Holds up to 100 lbs. Heavy-duty, double wall corrugated boxes provide maximum protection to ensure that your shipments arrive safe. Sizes are inside dimensions (usable space) L W H(D). Shipped flat and bundled for compact storage. Assembles in seconds, just fold and tape. 100% recyclable. Double Wall Boxes are manufactured from heavy duty 275#DW/ECT 48corrugated. Dimensions: 09"x9"x6 1/2". Capacity (Cu. Ft. ): 0. 60. 25/Bundle. Twice the protection of a standard carton.