GHP Pack of 500 Durable Self-Sealing Kraft 12"W x 15"L Bubble Envelope Mailers Lined with bubble wrap for protection. Self-sealing, peel and stick, adhesive keeps contents secure and tamper proof. Extremely durable and lightweight kraft material helps save on postage. Surface easily accept ink, stamps, and labels. Approved for USPS, FedEx, UPS, and DHL.