The Topeak Aero Wedge Saddle Bag is an aero shaped wedge pack with an easy-to-use quick release or strap mounting system. It features a safety light mount for extra safety in the dark and a 3M reflective strip to help keep you visible in low light conditions. The bag is made from 1000 Denier Teflon coated fabric. Available sizes: 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), and Large (11.4x21.6x14cm, 1.48-1.97L, 176g). The Medium size has an expanding design and a built-in pump holder.