Osprey Hydraulics 500ml SoftFlask

With this 500-ml soft flask, specifically designed for running vests, you can easily drink while running without stopping. A removable WingStay stabilization insert prevents the bottle from bouncing, while the wide opening makes it easy to add ice cubes or mix electrolyte drinks. The high-flow valve, the grippy screw cap, and the tapered shape make drinking on the go easier. Made from durable TPU with HF-welded seams and compatible with the UltraFlask Filter Cap.