EcoSwift 20 12x6x4 Corrugated Cardboard Packing Boxes Mailing Moving Shipping Box Cartons EcoSwift 20 12x6x4 corrugated cardboard packing boxes mailing moving shipping box cartons 200-LB Single Wall Corrugated High strength seams for maximum protection Approved for USPS, FedEx, UPS, and DHL Dimensions: 12" x 6" x 4"