The Topeak Aero Wedge Saddle Bag is an aero shaped wedge pack with easy-to-use quick release or strap mounting system. Coming in several sizes to suit your needs and features include a safety light mount for extra safety in the dark and 3M reflective strip to help keep you visible in low light conditions.1000 Denier Teflon coated fabric3M Scotchlite reflective stripExpanding design (M, L)Built-in pump holder (M, L)Tail light strapMicro: 6.6x14x8.1cm, 0.41L, 87gSmall: 7.1x17.8x10.9cm, 0.66L, 105gMedium: 9.6x20.3x12.7cm, 0.98-1.31L, 135gLarge: 11.4x21.6x14cm, 1.48-1.97L, 176g