- Soft 500ml collapsible flask fits snugly in hydration vest pockets and shrinks as you drink to reduce water movement.
- SpeedFill cap flips open for quick refills and snaps closed for a leak-proof seal.
- Includes 2 durable silicone bite valve sheath replacements that fit all HydraPak reservoirs, soft flasks and ultra flasks.
- Sheaths have inner posts and provide a soft bite.
- Great for runners and outdoor adventurers who need reliable on-the-go hydration.
The HydraPak UltraFlask Speed 500ml collapsible soft flask pairs perfectly with the HydraPak Bite Valve Replacement Sheath 2-pack. The soft 500ml UltraFlask fits snugly in most vest pockets, shrinking as you drink to minimize water movement, while the easy open SpeedFill cap enables fast refills. Combine it with the durable silicone replacement sheath that fits all HydraPak bite valves, providing a soft bite and extending the life of your hydration system. With 17oz capacity and a leakproof seal, the UltraFlask keeps you hydrated on runs and outdoor adventures, made even easier to drink from with the refreshed bite valve.
