Columbian CO981 12-1/2x18-1/2-Inch Catalog Brown Kraft Envelopes, 25 Count Designed for filing, storing & transferring of artwork, presentation materials, blueprints, maps and other larger materials. Heavy-duty 28lb opaque brown kraft material provides privacy of contents. Non-adhesive closure. 12-1/2" x 18-1/2" 25 envelopes