Aero shaped wedge pack with easy-to-use quick release system. Specification 1000 Denier Teflon coated fabric 3M Scotchlite reflective strip Expanding design (M, L) Built-in pump holder (M, L) Tail light strap 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, 176g Aerodynamic seat bag holds tubes, tools and other repair items. Mounts with an innovative Quick Release Bracket to fit onto saddle rails Fits 27.2 - 34.9mm diameter seat posts 3M reflective strip and safety light clip 1.48 to 1.97 Litre capacity, weight 176g