Poly Mailers 12.5 X 16.5 Inches 2 Mil Thickness 1000 Pack Shipping Envelopes Mailer Self Sealed Mailing Bags with Waterproof and Tear-proof Postal Bags Description: Poly Mailers have a good stretch, lightweight and water-resistant. Lower the shipping cost of your business and protect your products on the rainy or snowy day.The adhesive on the fold-over flap is really strong and tamper-evident. There’s no need reinforcement tape and it doesn’t come apart unless you tear it up.The shipping envelopes mailers are perfect for sending clothes and other small soft presents.Made with opaque polyethylene film, rather than paper, to provide top of the line security. Our flexible mailers have a solid exterior and black lining interior for extra concealment.Made with opaque polyethylene film, rather than paper, to provide top of the line security. Our flexible mailers have a solid exterior and black lining interior for extra concealment. Package Include:1000 X Poly Mailer