Stayflats Mailers | Reusable Rigid Shipping Envelopes | Repurpose Easy Packaging With Tab Lock Closure | Built-In Corner Protection | Stays Flat During Delivery | Kraft | 100 Per Case | 13" x 18" REUSE AND REPURPOSE: The Stayflats envelope mailers have a reusable tab lock closure which is easy to open and close. These mailing envelopes can be repurposed and used again and again. RIGID AND STRONG CONSTRUCTION: The Stayflats envelope mailers eliminate the need for cardboard stiffeners. They are designed with a strong and rigid center-seam which protects your documents and keeps them flat during delivery. PROTECTED CORNERS: The corners of your documents are now safe thanks to our Built-In corner protection design. No need to worry about jagged or torn edges. Your documents will arrive in the same condition as you sent them. EASY OPENING: This design comes with a tear strip which provides a quick, easy and frustration free opening experience for the end user. IDEAL FOR: Documents, Photographs, Diplomas, Awards, Calendars, Medical Records, Legal Forms and other bend-sensitive items.