Poly Mailer:Poly Mailers are a popular choice for all ecommerce businesses. Equipped with an adhesive strip for sealing. Packaging is both simple and fast, providing a great way to ship your goods. Not only are they quick and efficient, they are also water resistant and tamper evident, allowing you to ship your items confidently. They are extremely cheap, lightweight, and take up less space than boxes. They're perfect for non-fragile items.2.5 Mil Poly Mailer:These 2.5 Mil Poly Mailers are the perfect solution for shipping lightweight materials. With water and tamper resistance, and a self-sealing lip with a synthetic rubber adhesive, these provide a safe and secure way to ship your packages. Not only are these mailers secure, they are lightweight as well, resulting in savings during the shipping process. Their White/Grey exterior also makes ink, stamps and labels easily visible. Whether shipping clothing, books, or pretty much anything that can fit in the bag, you can ship confidently using these mailers.Item Specfication:● Thickness: 2.5 MIL +/- 5%● 1000 envelopes per Case● Case Weight= 18.5 lbs● Measured Width x Length = 9” x 12”● White/Grey Color● Approved by UPS, FedEx, and USPS● Puncture resistant and tamper/water proof● Interior color of mailer is subject to change● Provides excellent protection during shipments● High adhesive seal strip-packages are tightly secured after 3-5 minutes sealed.DISCLAIMER: ALL PICTURES SHOWN ARE FOR ILLUSTRATION PURPOSE ONLY. ACTUAL PRODUCT MAY VARY DUE TO PRODUCT ENHANCEMENT.