Aero Wedge - Strap Mount by Topeak is an aerodynamic shaped wedge pack that can be easily mounted with a quick release or strap system. Made from durable 1000 Denier Teflon coated fabric, this pack is built to last. It also features a 3M Scotchlite reflective strip for added visibility. The pack has an expanding design available in different sizes: small, medium, and large. The medium and large sizes have a built-in pump holder for added convenience. The pack also comes with a tail light strap, allowing you to attach a light for increased safety during night rides. Please note that the sizes and weights of the pack are as follows:- Small: 7.1x17.8x10.9cm, 0.66L, 105g- Medium: 9.6x20.3x12.7cm, 0.98-1.31L, 135g- Large: 11.4x21.6x14cm, 1.48-1.97L, 176gChoose the Aero Wedge - Strap Mount by Topeak for a practical and stylish way to carry your belongings while cycling.