Catalog envelopes with Redi-Strip closure for home or office mailing, storage and organizing. Keeping your home or business organized is imperative Whatever your needs, catalog envelopes are a must for keeping projects, files and mailings manageable. These heavyweight catalog envelopes are made of 28-lb stock that can withstand extensive handling, as well as mailing. Seam Type: Center Flap Type: Cheese Blade Trade Size: 13 1/2 Security Tinted: No.