Sure you've got your water bottles for your bike rides, but for liquids of the a different sort, Ahearne Cycles got you covered. The Mud Flask Seat Mounted Holder mounts to the rails of any bike saddle and securely carries your flask, much like the function of a water bottle cage. A tubular stainless steel cage with an aluminum bar, it fastens into the bend in the seat rails and can carry any standard 6- or 8-oz flask.