The USWE Roll-Top Saddle Bag is a waterproof, one-piece seat bag for bikepacking, gravel and trail days - easy to fit, compressible and bounce-free. Waterproof roll-top closure with tough 420D diamond ripstop fabric Air valve purges excess volume to compress and stabilize the load Straps wrap the saddle rails and seatpost to stop vertical sway Hypalon patches on the roll-top and skull logo provide rear-light and gear attachment points Approx. 9L capacity, about 380 g (13.4 oz) Fits virtually all saddles - MTB, e-MTB, gravel and adventure