Durable 2 mil poly material for resisting tears, punctures and damages.Hassle free, self sealing adhesive.Light weight mailers for economical postage.Excellent proficiency mailers perfect for shipping a wide variety of non-fragile items.Customer satisfaction guaranteed. Please do not hesitate to contact us with any questions or concerns. 10×13 inches and 2 mil thick ~Christmas Holiday~ poly mailing envelope bags. Excellent Quality. Self-sealing for protected packages! Water and weather resistant. Privacy guaranteed by silver inner layer. Flexible superior adhesive allows for over-stuffing. Shipping quality approved. UPS, FedEx & USPS accepted. Fast and tactful shipping! Buy with Confidence!