This expandable yet compact saddle bag is compatible with all bikes which have railed saddles, designed as a wedge for the most aero-dynamic shape, whilst still maximising capacity. Fitting securely to the seat post and the underside of the saddle, it comes with a quick release clip so that you can easily take it with you without having to undo all of the straps. Dimensions: 9.6x20.3x12.7cmWeight: 135gCapacity: 0.98 L - 1.31 LMaterial: 1000 Denier Teflon coated fabricSeatpost Diameter: Fits ø27.2 - ø34.9 mmExpanding design with built-in pump holder3M reflective stripTail light strap