12" x 15-1/2" catalog envelopes are made from heavyweight, 28 lb. brown Kraft stock and feature gummed flaps for home or office mailing, storing and organizing. They are a must for keeping projects, files and mailings manageable. Sturdy, 28 lb. stock is great for extensive handling and mailing. Contents are protected during use to give you assurance they arrive unharmed. 12" x 15-1/2" size accommodates standard-size or larger documents without folding. Fully gummed flap provides a secure, permanent seal.