General Supply Brown Corrugated - Fixed-Depth Shipping Boxes, 18l x 24w x 18h, 10/BundleProtect shipping contents with sturdy 200-lb.test corrugated Kraft boxes. Constructed of heavy-duty ECT-32-C Flute corrugated material. Shipped flat. Assemble with shipping tape (sold separately). Mailing Boxes/Tubes Type: Shipping Carton; Length: 18"; Width: 24"; Depth: 18".