White Stayflats® mailers in the 9 3/4 x 12 1/4 inch format are built from rigid white chipboard that resists bending and flexing during transit. The self-contained construction eliminates the need for internal stiffeners, and the tab lock closure secures contents without tape or additional fasteners.

These mailers are a practical fit for e-commerce, publishing, photography studios, legal and administrative offices, and retail distribution operations. Common contents include documents, certificates, unbound books, photos, fine art prints, and other flat media where arrival condition is critical to the customer experience.

The white exterior presents cleanly for outbound consumer-facing shipments. Interior dimensions accommodate standard letter-size and near-letter-size contents with space for a slip sheet or lightweight insert. Each case contains 100 mailers and ships via parcel carrier.