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Salomon Soft Flask Review: Compact, packable hydration for runners

Salomon Soft Flask 500ml/17oz 42 Unisex Hydration, Easy to Use, Comfort, and High-flow Valve, Blue
4.6
[Wide 42mm Cap]  High-flow wide cap enables easy refills and adding ice for faster drinking.
[High-Flow Valve]  Intuitive valve lets you drink quickly and effortlessly during intense activity.
[Pocket-Friendly Flex]  Soft, flexible flask conforms to your pocket for enhanced comfort on the move.
[Shrink-As-You-Drink]  Collapses as liquid is consumed to minimize water bounce and sloshing.
[Perfect for Runners]  Designed for fast-paced use, keeping hydration quick and accessible while active.
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Sports hydration designed for quick refills and fuss-free drinking. Salomon Soft Flask packs down as liquid is consumed, reducing bounce and remaining comfortable in a running pocket. Is it the right choice for runners and hikers who need reliable, compact hydration?

⚡ At a Glance
  • Refillability: Wide 42mm cap allows fast refills and makes adding ice straightforward
  • Best for: Runners, trail runners and hikers who want lightweight, packable hydration
  • Not ideal for: Users who prefer rigid bottles or integrated filtration systems

500ml soft flask with a wide 42mm cap and high-flow valve. Compressible design reduces bounce and stores neatly when empty.


Fast, fuss-free drinking - with a wide 42mm cap and high-flow valve

The wide 42mm cap allows rapid refills and makes adding ice simple, while the high-flow valve permits a strong, low-resistance flow when drinking. The valve design responds when bitten or pulled, so liquid moves quickly with minimal suction effort.

Quick hydration without pausing for careful sipping, useful during intervals or long steady runs.

Comfortable carry - thanks to soft, flexible construction

Soft, flexible material conforms to a pocket and reduces movement as volume decreases, shrinking as liquid is consumed to limit slosh and bounce. The unisex shape sits low in a pocket for balanced carry.

A secure, low-profile fit in running packs or shorts pockets, reducing distraction on uneven terrain.

Packable and reliable - with compressible design and leak-resistant performance

Collapsible form factors shrink with use, making the flask significantly smaller when empty, and user feedback highlights leak-free behaviour when stowed. The cap plus valve arrangement helps prevent spills during transport.

Stashes easily in a pocket or pack without worrying about unexpected wet kit, handy for multi-day outings or race-day layouts.

✨ The 4 Key Reasons for Salomon Soft Flask
  1. Wide 42mm cap - Enables fast refills and adding ice cubes quickly on the go
  2. High-flow valve - Allows quick, low-effort drinking during fast-paced activities such as interval runs
  3. Compressible construction - Packs down small for lightweight carrying and compact storage
  4. Leak-resistant design - Trusted by users for packing without unexpected spills
📋 Technical Details at a Glance
  • Category: Sports hydration flask
  • Capacity: 500ml / 17oz
  • Cap opening: 42mm wide cap
  • Valve: High-flow drinking valve
  • Construction: Soft, flexible and compressible
❓ Frequently Asked Questions

Q: How easy is it to refill and add ice?

A: The wide 42mm cap makes refilling straightforward, and the opening is large enough to add ice cubes without difficulty.

Q: Will it bounce in a pocket while running?

A: Soft, flexible construction shrinks as liquid is consumed, which helps minimise water bounce and keeps carry comfortable during runs.

Q: Is it reliably leak-free for packing with other kit?

A: Several user reviews describe the flask as leak-free, and the combination of cap and high-flow valve is designed to reduce spills when stowed.

🏆 Our Verdict

The Salomon Soft Flask is ideal for runners and hikers who need a lightweight, packable hydration solution that drinks quickly. A wide 42mm cap paired with a high-flow valve and compressible shape makes refilling, drinking and stowing straightforward and low-fuss. Durable, user-validated leak resistance gives good long-term value for regular outdoor use.