Online sellers and frequent shippers, this 120-piece poly mailer set is about to make your packaging life so much easier! You get four different sizes to handle pretty much anything: 8x12 inches (60 pieces), 10x14 inches (30 pieces), 13x18 inches (20 pieces), and 15x20 inches (10 pieces). The self-sealing design is genius - just peel off the adhesive strip and press it closed, no tape needed! The waterproof material protects your items from moisture, and the tear-resistant construction means your packages arrive looking professional. The opaque colors keep your contents private, which is perfect for gifts or reselling items. These are lightweight enough to save on shipping costs but durable enough to protect clothes, soft goods, and other non-fragile items during transit. The mixed colors add some variety to your packaging, and having multiple sizes means you're never stuck using an envelope that's way too big or too small for what you're shipping. They're perfect for Etsy sellers, eBay businesses, or anyone who frequently mails packages to friends and family. The quality is noticeably better than cheap mailers - the adhesive actually sticks properly and doesn't come undone during shipping. Whether you're running a small business or just need reliable shipping supplies for holiday gifts, this 120-piece set gives you everything you need at a great price per envelope!