Boxes - Double Wall Item Code: Type: Sold By Quantity Corrugated Boxes Double Wall Description The industry standard of cartons! Double Wall, Heavy Duty cartons are constructed from strong 275#/48 ECT (Edge Crush Test), Kraft corrugated (unless otherwise noted). All cartons ship and store flat to save space. Corrugated cartons are all 100% recyclable. Must be ordered in full bundle quantities. Special order sizes available upon request.