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XXL POLY MAILERS 24 x 21 x 6 inches: Self-sealing Extra Tough Tear Proof Plastic mailing bags. Pack of 30 privacy-lined envelopes with 6 inch gusseted expansion. WE DESIGNED AND PERFECTED THESE for our own business. We ship a lot of bulky items such as cushions, clothing and boxed goods and so created this strong waterproof bag that was easy and fast to use. We have been using them for years and now we are offering them to you. IDEAL FOR ONLINE SELLERS, Commercial Mailers, Offices, Sending gifts for the Holidays. PROFESSIONAL LOOK. White shipping envelopes are the preferred look for serious online retailers - and that includes Amazon. GUARANTEED PREMIUM QUALITY: Strong, Waterproof, Easy content insertion due to super low-friction lining. Shipping labels adhere easily and will not come off. Ever. Designed for US Post Office, UPS, FedEx, DHL and all International Carriers. These tough heavy duty mail packets are totally Shipping Carrier proof. SECURE: Your contents will remain private as the bags are 100% opaque. The self-seal industrial strength adhesive closure cannot be opened once sealed, so the contents cannot be tampered with or stolen en-route.