EcoSwift Brand Premium 9x4x3 Cardboard Boxes Mailing Packing Shipping Box Corrugated Carton 23 ECT, 9"x4"x3", Brown, 150-Pack

200-LB Single Wall Corrugated. 23-LB Edge Crush Test (ECT). Extremely lightweight material helps save on postage. High strength seams for maximum protection. Surface easily accepts ink, stamps, and labels. Approved for USPS, FedEx, UPS, and DHL.