- Soft flask can be easily removed from sleeve, and used in Nathan hydration vest pockets
- 18 ounce/535 mL BPA-free soft flask with bite valve
- Small stash pockets for gels or a key
- Contains a rigid ExoSpine in the handheld, the flask is easy to hold onto regardless of how much water is in the flask
- Conforms to any shape to eliminate sloshing
- Breathable wicking mesh under hand position provides superior grip
- Ergo-designed hand strap provides grip-free comfort, and maximizes running efficiency