Sunlite's Rack Pack w/Pannier gives you much needed cargo space. It attaches to any rear rack top quickly and easily. The separate compartments keep your gear organized and bungee cords on the top let you strap extra gear so it's within easy reach (think rain gear). The integrated pannier bags let you carry more, a very nice touch. The whole bag is made with waterproof 600 denier polyester and uses heavy-duty zippers and reflective accents throughout.