6" x 9" catalog envelopes feature a gummed flap and heavyweight, 28 lb. brown Kraft stock for home or office mailing, storing and organizing. They are a must for keeping projects, files and mailings manageable. 28 lb. brown Kraft stock withstands extensive handling and mailing. Contents are protected during use to give you assurance they arrive unharmed. Envelopes are perfect for folded or smaller documents. Fully gummed flap provides a secure, permanent seal.