9" x 12" booklet envelopes are made with heavyweight stock for home or office mailing, organizing and storing. Whatever your needs, booklet envelopes are a must for keeping projects, files and mailings manageable. They are made from sturdy, 28 lb. white wove stock to withstand extensive handling and mailing. Contents are protected during use to give you assurance that they arrive unharmed. 9" x 12" size accommodates standard-size documents without folding. Pull-off, self-seal, Redi-Strip closure saves time and makes a secure, permanent seal.