HydraPak SOFTFLASK™ WMXS - 500 ml
- silicone
The 3-second version
- Compresses as you drink to eliminate bounce and slosh in vest pockets
- Wide 42 mm mouth makes refilling fast without spills
- Auto-sealing bite valve prevents leaks when stored
- Requires vest or pack with compatible pockets
- Won't stand upright when partially full
- Needs occasional cleaning inside the valve
Why it's on GiftsFeed
Collapsible running flask that shrinks as you drink to eliminate slosh
Rigid bottles bounce. Reservoirs with hoses add weight and failure points, and the tube flops around or gets in the way when you're moving fast. This collapsible flask compresses as you empty it, so the water stays put instead of sloshing with every footfall, and there's no tube to bite through or kink.
The difference shows up thirty miles into a run when you're tired and every ounce of wasted motion adds up. The flask conforms to your body, the valve seals reliably, and when you're done it disappears into a corner of your pack. For people who log serious trail miles, that simplicity matters more than clever features.
Good gift when
- Trail runners and fastpackers who carry water in vest pockets
- People who want hydration gear that packs down small when empty
- Runners tired of sloshing water bouncing during descents
- Anyone who prefers flasks over reservoir systems with hoses
Skip it if If you prefer rigid bottles that stand upright on their own, or if you need a reservoir with a hands-free drinking tube for activities where you can't easily reach a vest pocket.
Specs
- Capacity
- 500 ml (16.9 oz)
- Material
- 0.25 mm clear TPU film
- Mouth diameter
- 42 mm
- Valve type
- Non-locking bite valve with silicone sheath
- Construction
- Pinch-weld seams with tapered bottom
- Design
- Collapsible, compresses as you drink
What's included
- HydraPak SoftFlask 500 ml
- 42 mm bite valve cap with silicone-sheathed valve
If you're giving it
- No sizing to guess
Ships as a functional piece of gear without decorative packaging.
The details
This 500 ml collapsible flask solves the problem every trail runner knows: half-empty bottles that bounce and slosh inside your vest. As you drink, the flexible TPU body compresses down to match how much water remains, so the contents stay still and the flask keeps a low profile against your back or chest.
The wide 42 mm mouth makes refilling fast at aid stations or creek crossings without fumbling with narrow openings. The bite valve opens when you squeeze it between your teeth and seals automatically afterward, so you can tuck the flask back into a pocket without worrying about leaks soaking your gear or clothing.
Built from 0.25 mm clear TPU film, the flask weighs very little and folds nearly flat when empty, taking up almost no space in a pack on the return leg of an out-and-back route. The tapered bottom is shaped to fit the short, wide pockets found on most running vests, and the soft material conforms to the pocket shape rather than creating hard edges that dig into your ribs during long efforts.
The oval flange around the nozzle locks the flask into compatible vest pockets, keeping it secure even on technical descents. The silicone-sheathed bite valve delivers high flow when you need to drink quickly, and the non-locking cap stays in place during use while remaining easy to remove for cleaning.
Transparent construction lets you see exactly how much water remains at a glance, so you can plan your next refill without pulling the flask out to check. The pinch-weld seams are designed to handle repeated compression cycles without splitting, and the simple design has fewer parts to fail or clog compared to reservoir systems with long hoses.
Wide-mouth TPU hydration flask built to fit vest pockets and stay quiet on the move
Ships and sold by Hyperlite Mountain Gear. About this merchant
Questions
- Will this flask fit in any running vest pocket?
- The tapered shape is designed to fit the short, wide pockets found on most running vests. The oval flange around the nozzle locks into compatible pockets to keep the flask secure. Check that your vest pockets can accommodate a flask with a 42 mm mouth diameter and tapered body.
- Does the bite valve leak when the flask is turned upside down?
- The bite valve automatically seals after each sip to prevent drips and leaks. It only opens when you squeeze it between your teeth, so it stays sealed when stored in a pocket even if the flask shifts position during activity.
- How do I clean the inside of the flask and valve?
- The wide 42 mm mouth allows easy access for hand washing the interior. The cap is removable for cleaning the valve and nozzle. Let all parts dry completely before reassembling to prevent odor buildup.
- Can I freeze this flask with water inside?
- Freezing is not recommended. Water expands when frozen and can damage the pinch-weld seams or distort the TPU material. If you need cold water, start with chilled water or add ice cubes through the wide mouth before filling.
- Will the flask pack down small enough to fit in a pocket when empty?
- Yes, the flexible TPU material folds nearly flat when empty, taking up very little space. This makes it easy to stash in a pack or pocket on the return leg of a run when you no longer need to carry water.
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