Metronic 100 Pcs 10x13 Inch Dark Blue Poly Mailer Envelopes Shipping Bags with Self Adhesive, Waterproof and Tear-proof Postal Bags WIDELY USE - The dark blue 10x13 mailer bags are quite useful for small items, such like T-shirts, blankets, scarves, jewelry, or other tiny accessories etc. 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 dark 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 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.