- Poly mailers are polyethylene Mailing bags that are waterproof, self-sealing, and tamper-resistant with our non-static tear strip, they are considered the best choice for e-commerce packages as they are self-sealing and tear-resistent. Our Privacy shield makes our bag opaque providing privacy for the contents of your package. Easy to Use, poly mailers have a peel-and-seal closure, making it easy to secure your items. You can find them in different sizes, we have a huge selection. - Poly mailer bags are technically defined as “polyethylene mailers,” and are lightweight, weather-proof, easy-to-send envelopes often used as an alternative for corrugated cardboard boxes. They are easier to store than cardboard boxes. They are usually the most affordable way to send soft goods like apparel, blankets, purses, backpacks and much more. - Poly mailers are fabulous for mailing a wide variety of items. Self sealing poly mailer bags, provide outstanding low-cost protection. Upgrade your company image with confidence with these self-seal mailers. Maximize your success while reducing costs.Labels adhere easily and securely to them. - High Quality Poly Mailer bags 2.4 Mil thick Self Sealing Mailers. Poly Courier Mailers, Superior tear and puncture resistance. Pressure sensitive adhesive provides a high strength durable closure, water and dirt resistant. High strength seams allow for over-stuffing. Buy with confidence! - Poly mailers are polyethylene Mailing bags that are waterproof, self-sealing, and tamper-resistant with our non-static tear strip, they are considered the best choice for e-commerce packages as they are self-sealing and tear-resistent. Our Privacy shield makes our bag opaque providing privacy for the contents of your package. Easy to Use, poly mailers have a peel-and-seal closure, making it easy to secure your items. You can find them in different sizes, we have a huge selection.