6" x 9" catalog envelopes feature a self-seal closure and are an excellent solution for mailing, storing and organizing. They are a must for keeping projects, files and mailings manageable. Redi-Seal closure saves time and makes a secure, permanent seal. Simply press to seal - no moisture needed or pull-off strips to throw away. 28 lb. brown Kraft stock withstands extensive handling and mailing. Contents are protected during use to give you assurance that they arrive unharmed. 6" x 9" size accommodates an 8-1/2" x 11" folded sheet or smaller, unfolded documents.