White Stayflats® Mailers in 11 x 13 1/2 inch are rigid flat mailers constructed from white chipboard that acts as its own stiffener, eliminating the need for inserted boards or supplemental stiffening materials. The self-locking tab closure seals the mailer securely without tape or additional fasteners.

These mailers are well-suited for e-commerce retailers shipping prints and artwork, commercial photo labs, direct mail programs, and publishing operations sending galleys or promotional flats. The clean white exterior accepts printed labels and is compatible with branding overlays, making it practical for customer-facing shipments.

Each mailer comes in a case of 100 and weighs approximately 20.78 lbs. The parcel-friendly format supports high-volume replenishment without specialized receiving requirements.