12″ x 16″ x 2″, Open End Expansion Tyvek Catalog Envelope, No Window, Tyvek, Tyvek Paper, Paper Color: Bright White, Smooth Finish, Center Seam, Flap Down, Kwik-Tak, Water and Burst Resistant, 100 Qty / Box, 100 Qty / Ctn, 7.1 lbs.