Aero shaped wedge pack with easy-to-use quick release or strap mounting system.1000 Denier Teflon coated fabric 3M Scotchlite reflective strip Expanding design (M L) Built-in pump holder (M L) Tail light strap Micro: 6.6x 14x 8.1cm 0.41L 87g Small: 7.1x 17.8x 10.9cm 0.66L 105g Medium: 9.6x 20.3x 12.7cm 0.98-1.31L 135g Large: 11.4x 21.6x 14cm 1.48-1.97L 176g