Our 350 ML soft water flask for Running Vest is designed to give athletes maximum hydration on the go.

It's compact and durable to provide reliable performance. Its light squeeze and high-flow bite valve provide easy one-handed hydration and auto-seal after each sip.

Plus, its collapsible design makes it easy to freeze and chill overnight for a refreshing beverage.

Weighing only 68g, this ultra-light flask will fit easily into most hydration packs