13" x 16" x 2" Expansion Poly Mailers. Strong polyolefin mailers protect products from moisture during shipping. Feature gusseted sides to allow for thicker items such as binders, books and catalogs. Mailers are puncture and tear resistant. High strength seams will keep contents intact even if over packed. The outer surface of the mailer is white and the inner lining is silver. Close with peel and seal lip. Sold in case quantities.