Roptex® (Brown Kraft) Open Side Booklet - Open Side Booklets have their opening on the long dimension - offering inserting ease and convenience. These envelopes are manufactured with durable, SFI Certified Brown Kraft paper, two side seams under construction and a traditional remoistening seal.Brown Kraft (SFI CERTIFIED) Vellum Finish Two Side Seams Under No WindowRemoistening Seal Flap Down