Aviditi MFL18123 Corrugated Deluxe Literature Mailer, 18" Length x 12" Width x 3" Height, Oyster White (Bundle of 25) Maximum protection for your most important documents Manufactured from strong 200#/ECT32-B oyster white corrugated Assembles in seconds without tape, glue or staples Ships and stores flat to save space Measures 18-inches length by 12-inches width by 3-inches height