HydraPak Stow Mountain 350 ml soft flask, Redwood - collapsible hydration bottle

HydraPak Stow Mountain 350 ml soft flask, Redwood is a collapsible hydration bottle designed for active use where low weight and compact packing matter. With a 350 ml capacity, the soft body compresses as liquid is consumed to reduce sloshing and save space in pockets, vests or packs. The redwood color and flexible construction make it suitable for trail running, hiking and cycling when you need a reliable on-demand water source that stores flat when empty.

Advantages

The soft flask construction provides a lightweight alternative to rigid bottles while the compressible design minimizes movement of liquid and reduces bounce during activity. Its compact form allows easy stowage in running vest pockets or jacket pockets, and the flexible material means the flask packs down nearly flat when emptied. The bite valve and threaded closure system ensure controlled flow and simple refilling without elaborate tools.

Suitable for

• Trail running and race-day hydration
• Day hiking and fastpacking
• Road and gravel cycling where minimal bulk is required
• Travel and commuting when space-saving is important

Key specifications

• Capacity: 350 ml
• Material: flexible, food-safe soft plastic (collapsible body)
• Closure: threaded cap with bite valve for controlled flow
• Weight: designed for lightweight carry (soft-flask class)
• Color: Redwood

How to use

Fill the soft flask with water or an appropriate hydration drink through the threaded opening, then close the cap securely. Use the bite valve to drink hands-free or to control flow; the body will compress naturally as liquid is taken, reducing slosh and making the flask more compact. Rinse and dry after each use to maintain hygiene and avoid residual odors. Store the flask empty and flat to save space when not in use.

Usage recommendations

Rinse the flask before first use and periodically clean with mild soap and warm water. Avoid exposing the soft flask to boiling liquids or prolonged direct sunlight. For freezing or carbonated liquids, consult the manufacturer's guidance to prevent damage. Replace the bite valve if it shows wear to maintain reliable flow control.