White Stayflats® Mailers at 12 3/4 x 15 inch deliver rigid, lightweight protection for flat materials in transit. Built from white chipboard, the mailer body itself provides the stiffening — no separate inserts are needed to keep contents flat through postal or courier handling.

The tab-lock closure seals the flap without tape or additional materials, making these mailers well suited for high-volume pack-out in fulfillment centers, print shops, photography studios, and professional offices sending large-format documents, prints, or artwork.

The white chipboard exterior presents a clean, professional face for outbound shipments and retail correspondence. Each case contains 100 mailers, and the lightweight construction helps control per-piece postage costs at volume.