9" x 12" Hi Bulk Catalog Envelopes feature a self-seal closure and High Bulk, 24 lb. Kraft stock for mailing, storing and organizing. They are a must for keeping projects, files and mailings manageable. High Bulk, 24 lb. brown Kraft stock withstands extensive handling and mailing. Stock is made with less paper but maintains the look and feel similar to standard Kraft paper. Contents are protected during use to give you assurance they arrive unharmed. 9" x 12" size accommodates standard-size, 8-1/2" x 11" documents without folding. Redi-Seal closure saves time and produces a secure, permanent seal.