These 10x13-inch poly mailers are constructed from 2.75-mil polyethylene. They are intended for packaging and shipping soft, non-fragile items such as apparel and documents. Each bag features a pressure-sensitive, self-sealing adhesive closure designed to help keep contents secure during transit. The mailers are lightweight, which can contribute to lower postage costs. The white exterior provides a surface suitable for labels and shipping information. These mailers are not padded and are not recommended for breakable items. This product contains 1,000 poly mailer bags per carton. It is commonly used in retail, warehousing, and e-commerce fulfillment environments where consistent packaging is needed.