Mistmo 6" X 9" 100pc (2Mil) Poly Mailers Shipping Envelopes Water Resistant Bags Self-sealing Shipping Supplies High-efficiency self-sealing mailers are perfect for shipping a wide variety of non-fragile items Easy-peel pressure sensitive adhesive provides a high strength durable closure, water and dirt resistant The silver inner layer provides confidentiality. THICKNESS: 2.0 MIL! Real Difference! Thick poly material, durable yet with lightweight, saved you a bunch on shipping cost! USPS, UPS, FedEx Approved, expedite shipping available. Wholesale price for retail amount!