Pack includes 100 poly mailers for routine shipping and business use Made to help protect contents from moisture with a waterproof design and tear-resistant material Self-sealing closure with a peel-and-seal adhesive strip helps keep packages securely closed without extra tape Lightweight construction can help reduce shipping weight for small business, online order, and retail use Black mailers provide a neat, simple appearance while helping keep contents private Size: 12″x15.5″ Suitable for mailing clothing, books, jewelry, cosmetics, accessories, and other small items Designed for shipping soft goods and small products during transit