Reinforced, multi-layered paper material Moisture-resistant, linen-like surface. Flap-Stik closure requires no moisture to seal. Release strip is easily accessible, yet maintains security of contents. Quality Park(R) Ship-Lite Catalog Envelopes, First Class, 9in. x 12in., White, Box Of 100 is one of many Large Catalog Envelopes available through Office Depot. Made by Quality Park.