Convenient size, full of features, easy mounting and incredible value. Rugged, fully rigid construction holds bag shape even when empty. Fully adjustable mounting system includes two pull-straps; mount onto sissy bar, luggage rack or back seat. Zip/hook-and-loop wide top opening with gusseted zip front. Top carry handle and backpack/shoulder strap for easy toting off bike. Lockable zipper pulls. Ssr12 features exterior mesh pockets for easy access to maps and other items; Ssr19 features three exterior zippered pockets for easy access to maps and other items. Constructed of UV-, water- and weather-resistant 12-denier saddle tuff and saddle Hyde panels. Ssr12 dimensions: 1" w x 15" H x 8" D; measures 1,2 cubic inches. Ssr19 dimensions: 16" w x 17" H x 11.5" D; measures 1,9 cubic inches.