EcoSwift 100 4x4x3 Corrugated Cardboard Packing Boxes Mailing Moving Shipping Box Cartons EcoSwift 100 4x4x3 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: 4" x 4" x 3"