The Topeak Aero Wedge - Quickclick Mount is an aero-shaped wedge pack designed for easy installation and removal with a quick release or strap mounting system. Made from 1000 Denier Teflon coated fabric, this pack is durable and water-resistant. For added safety, the pack features a 3M Scotchlite reflective strip, making you more visible on the road. The expanding design allows you to customize the capacity of the pack, with options ranging from 0.41L to 1.97L. The medium and large sizes also include a built-in pump holder, ensuring that you have a convenient place to store your pump. Additionally, all sizes come with a tail light strap, so you can easily attach a light to increase your visibility. Choose the size that suits your needs:- Micro: 6.6x14x8.1cm, 0.41L, 87g- 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, 176gUpgrade your bike with the Topeak Aero Wedge - Quickclick Mount and enjoy the convenience and functionality it provides.