UltrAspire Softflask
Best collapsible hydration flask for long-distance trail runners.
This collapsible flask is the ultimate solution for runners who hate the sloshing bulk of rigid bottles. Its contoured shape slides effortlessly into vest pockets, and the wide mouth makes mid-run refills a breeze. You sacrifice the durability of a hard bottle, but you gain unmatched comfort and portability.
$24.00
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Who it's for
- Ultrarunners needing to minimize vest bulk and sloshing
- Athletes requiring fast, hands-free hydration while moving
- Runners prone to chafing from rigid hydration bottles
Who should skip it
- Users wanting low-maintenance gear that is easy to clean
- Hikers carrying sharp gear who prioritize extreme durability
- Racers needing quick, stable refills at busy aid stations
Performance breakdown
Portability
Collapsible design shrinks down to almost nothing when the water runs out.
Refill Efficiency
Wide 42mm opening makes mid-run ice or electrolyte loading a breeze.
Vest Integration
Slim, contoured profile slides into tight vest pockets without snagging.
Flow Rate
Silicone bite valve delivers consistent hydration without requiring excessive suction effort.
Material Safety
BPA and PVC-free construction ensures no plastic aftertaste during long efforts.
Weight Efficiency
Featherlight build keeps your kit minimal for high-performance trail days.
Key Specs
Capacity
0.5 liters
Weight
1.6 ounces
Material
Silicone
Closure Type
Bite Valve
Mouth Opening Diameter
1.65 inches
BPA Free
Yes
Collapsible
Yes
Product Type
Soft Flask
Age Group
Adult
Insulated
No
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