100 - 12x15.5 Lightweight Self Sealing Tear & Puncture Resistant Poly Mailers Envelope Shipping Bags 2.6 Mil - These poly mailers were white outer surface, black inner lining, so it looks like light grey color not a true bright white. The Mailing Bags used of opaque materials convenient for protect your privacy with a professional appearance High Quality & Durable - Top-quality poly mailers are tear and puncture resistant. Even though poly mailers don't offer interior cushioning, they are made to withstand the rigors of the shipping process. A poly mailer is usually made of polyethylene but can also be made of heavy-duty nylon fibers. Poly mailers are a great choice for their high-strength design that keeps contents secure against moisture, chemicals, tampering, puncturing and tearing UPS, FedEx & USPS APPROVED - The mailer bags are quite useful for soft items, such like T-shirts, blankets, scarves, or other non breakable items Waterproof - The poly mailer are self-sealing for easy packing with a tamper-evident, super secure closure. Pressure sensitive adhesive provides a high strength, durable closure that is water and dirt resistant. The Plastic Mailing is thin, durable, and quite flexible, so they're very forgiving of weirdly-shaped contents, and it's easy to add in a bit of padding, like newspaper or bubble wrap, for extra protection Easy To Use - The white mailing bags have a peel-off strip that is very sticky that will seal the bag very well, it's quick seal, no licking or water needed. The poly mailer bags are a good strong plastic shipping bag. If you have many orders need to post everyday, these plastic mailing bags perfect for you