The Topeak Aero Wedge Pack is the perfect seat bag for those long rides. It&';s aerodynamic design cuts down on wind resistance so you can go faster. It also holds tubes, tools and other repair items so you&';re always prepared. The QuickClick system makes it easy to mount and remove. Plus, four size options ensure you get the perfect fit. a Medium & large expand to add 20-30% more volume a Large openings swallow up all of your gear a Features a light clip for extra safety a 3M(TM) reflective strip for increased nighttime visibility