Don't be left on the trail or side of the road without flat fixing equipment. The Topeak Medium Aero Seat Wedge Saddle Bag with Velcro is intended for all cyclists, including commuters, tourists, and fitness riders alike. The Medium Aero Seat Bag can be mounted on most seats and is designed to carry tubes, a pair of tire levers, a multi tool, a patch kit, a CO2 inflator, and other items. The bag is designed to be used on all road, mountain, hybrid, BMX and triathlon style bikes. Our Aero Wedge Pack is designed with the most aerodynamic profile and its slightly narrower width eliminates thigh rub and stays hidden from the wind. Safety features include reflective strip, and strap to mount tail light. The Medium Aero Bag can also expand to add 20 30% more volume. This is our most popular bag due to its versatile size and features. 1200 Denier Polyester. Dupont Teflon Coating is light weight and provides durability and weather resistance. Traditional strap mounting with Velcro. Size L x W x H: 20x11x12 cm 7.9x4.3x4.7 inches Weight: 130 grams 154L 33 cubic inches.