EcoSwift Brand Premium Self-Seal Rigid Cardboard Mailer 250GSM, 12.5 in. x 9.5 in., White, 500-Pack

Self-sealing, peel and stick, adhesive keeps contents secure and tamper proof. Extremely durable and lightweight cardboard material helps save on postage. Provides bend resistance. Surface easily accepts ink, stamps, and labels. Approved for USPS, FedEx, UPS, and DHL.