10" x 13" catalog envelopes feature gummed flaps and heavyweight, 28 lb. brown Kraft stock for home or office mailing, organizing and storing. Catalog envelopes keep projects, files and mailings manageable. Sturdy stock withstands extensive handling and mailing. 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. Fully gummed flap ensures a secure seal.