How do you keep your customers coming back for more? You show them how much you appreciate them. Take your customer service to the next level with our 10 x 13 Glossy Poly Mailer Envelopes. Whether you’re shipping t-shirts and accessories or a hand-stamped, leather-bound notebook, you can be sure that these poly mailers will help ensure your customer knows you care from the minute they open their mailbox. Made from heavy-duty polyethylene plastic, these poly mailers will protect your merchandise from tears, rips, and punctures, as well as keep out dirt, liquid, and dust. And thanks to our self-adhesive seal strip, the packaging is faster and easier than ever. Peel the protective paper off the adhesive and fold the flap over to create a high-strength closure. When you’re ready to send your package on its way, your poly mailer will provide another surprise: lower shipping costs than traditional cardboard packaging. The lightweight design makes for more economical postage.