A proven favourite - the Topeak Aero Wedge is all you need for storing the basics under your saddle on any ride. This aerodynamic seat bag holds tubes, tools and other repair items.Features: Medium and large sizes feature a zip to expand and add 20-30% more volume. Large openings make it easy to load and retrieve your gear. Features a light clip for extra safety. 3M™ reflective strip for increased nighttime visibility. Water resistant to keep your electronic devices safe.