This pack of Toughmailer poly mailer expansion bags contains 50 units of 10×12 inch envelopes, perfect for packing and shipping various items. The bags are made of high-quality materials that ensure durability and protection for your products during transit. The mailers can be used for a range of purposes, from sending documents to mailing small items. The bags are easy to use, with a self-sealing adhesive strip that makes packing a breeze. Whether you’re a small business owner or an individual looking to ship items securely, these poly mailer expansion bags are a great choice.