50-500 19×24 in Self Seal Poly Mailers 2.5 mil thick.  Water, Tear and Puncture resistant The silver inner layer provides confidentiality High-efficiency mailers are perfect for shipping a wide variety of non-fragile items Pressure sensitive adhesive provides a high strength durable closure, water and dirt resistant UPS, USPS, and FEDEX approved50-500 19×24 in Self Seal Poly Mailers (as your choice) 2.5 mil thick. Water, Tear and Puncture resistant The silver inner layer provides confidentiality High-efficiency mailers are perfect for shipping a wide variety of non-fragile items Pressure sensitive adhesive provides a high strength durable closure, water and dirt resistant UPS, USPS, and FEDEX approved