Not only are these mailers great for shipping, but they also make fantastic gift wrap! No tape is needed thanks to the seal sealing feature. Plus, they're lightweight which means you'll save on postage costs. Our Succulent Flowers Poly Mailers have been approved by the United States Postal Service (USPS), UPS, and FedEx. They're also incredibly durable with superior tear and puncture resistance. The high strength seams allow you to over-stuff if needed without worrying about any damage.