Do Not Bend Flat Mailers are lightweight paperboard mailers designed to help protect photographs, documents, prints, certificates, and other flat items during mailing or shipping. Each mailer features a preprinted “Do Not Bend” message for added handling visibility, along with a peel-off adhesive strip for quick, tape-free closure. Made from 100% recycled paperboard and fully recyclable, these mailers are a practical choice for offices, schools, printers, ecommerce sellers, and fulfillment teams.