Heavy-Duty Double Wall X-Large Moving Boxes, 24"L x 24"W x 18"H, Kraft (Pack of 10). These extra-large heavy-duty double wall moving boxes are great for packing and moving heavier items. Heavy-duty construction provides greater protection and stacking strength. Manufactured from heavy-duty 275#DW/ECT-48 Kraft corrugated. Cartons are sold in bundle quantities and ship flat to save on storage space and shipping. 10 Boxes per Bundle.