Metronic 100 9x12" Poly Mailers Envelopes Shipping Bags with Self Adhesive, Waterproof and Tear-proof Postal Bags (Blue) WIDELY USE - The blue 9x12 mailer bags are quite useful for soft items, such like T-shirts, blankets, scarves, or other non breakable items.. They are definitely quite durable and the sticky strip sticks very well. Once it's sealed, it won't come apart like other self-sealing envelopes. This is a great product for mailing anything in! WATER PROOF - 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. DURABLE PROTECTION - 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. PROVIDES CONFIDENTIALITY - These poly mailers are blue outer surface, black inner lining. The Mailing Bags used of opaque materials convenient for protect your privacy with a professional appearance. You don't have to worry about them tearing, adhesive holds up great. SAVE YOUR TIME AND SHIPPING COST - The poly mailer bags are good acceptable thickness for shipping soft-goods, these poly mailers 9x12 are very light weight, they are perfect for shipping out items without having to pay a lot of money. You can make them smaller if need be by folding them over. The blue 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. Top-quality poly mailers are tear and puncture resistant. Even though poly mailers don&#039;t offer interior cushioning, they are made to withstand the rigors of the shipping process. 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. 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. The 9x12 mailer bags are quite useful for soft items, such like T-shirts, blankets, scarves, or other non breakable items. They are definitely quite durable and the sticky strip sticks very well.