Brown Kraft Booklet Envelopes on 28lb. Pack of 50 (6 x 9) Booklet Envelopes - 28lb. Brown Kraft Brown kraft booklet envelopes Great for mailing Invoices, statements, catalogs or announcements brochures, annual reports, and product literature. A Quantity of 50 Inkjet & Laser Printer Compatible Regular Gummed Flap