Roll-top style pannier bag set with a fold over top that can be used to expand storage should you need a little extra room. With the top folded over the bag is rain resistant and holds 28L of storage with the top expanded it boasts an impressive 32L of storage space. Universal Bridge System (UBS) can be installed as is with the integrated straps or used in conjuction with many types of mounting plates (sold separately). Adjustable lower straps on the inside face of the bags allow them to be secured to the sides of pannier compatible rear racks for improved stability. Constructed of water repellant polyester it is a dependable bag that will offer years of reliability. Reflective accents on the bag`s sides front and rear faces improve visibility and safety