10" x 13" Hi Bulk Catalog Envelopes are an excellent solution for mailing, storing and organizing. They are a must for keeping projects, files and mailings manageable. Hi Bulk, 24 lb. brown Kraft stock withstands extensive handling and mailing. Stock is made with less paper but maintains a similar look and feel to standard Kraft paper. Contents are protected during use to give you assurance they arrive unharmed. 10" x 13" size accommodates standard size, 8-1/2" x 11" or larger documents without folding. Redi-Strip closure saves time and makes a secure, permanent seal. Simply peel off the strip and press.