Sunlite’s Utili-T Expandable Rack Bag 2 attaches to most rear rack tops quickly and easily so you can bring it with you across town or across the country. The expandable main compartment comes with removable dividers for easy organization while one rear and two side compartments provide additional storage. Plus, the bag is made from water-resistant 600-denier polyester and uses heavy-duty zippers and reflective accents throughout.