The Serfas Shuttle Bag features a universal easy-install rubber seat post mount and velcro saddle rail strap system. The main zippered compartment offers a 2 Litre capacity with extra interior mesh pocket and CO2 holders. Stealthy reflective black side panel accents offer a touch of added visibility at night without compromising on style. External taillight hang loop included for mounting rear lights when extra visibility is needed. A quick release design adds extra functionality.