UltrAspire Locking Cap Softflask
It's commonplace to store a couple of soft flasks in the back of a running belt or vest, and it can be a bit unwieldy. UltrAspire's 1-liter Locking Cap Softflask not only saves space but also saves grams compared to two 500ml soft flasks. The locking cap will remain drip-free, which, believe it or not, also saves precious calories. Stay hydrated with the 1 Liter Locking-Cap flask from UltrAspire.
- Check out the Funnel Scoop from Open Fuel for a sticky-free experience.
- Is a liter too much? Check out these smaller locking-cap options.
| Specifications | |
| Dimensions | 29cm x 9cm x 6cm |
|
Weight |
56g |
| Volume | 1 Liter |
| Specs Verified | Yes |
| Design | |
|
|
TPU, PP, HDPE, Silicon, Nylon |
| SkyRun Says | |
| Usage | Staying hydrated and leak-free |
| Notes | Keeps the sticky stuff in the flask |
| Bottom Line | Saves weight and space vs two 500ml flasks |
| Compare to other Soft Flasks | |
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Questions & Reviews
6/23/2026
Hey, will the 1L flask be able to fit in one of the sleeves of the new Raide vest?
6/24/2026
Hi Mark,
Based on our testing, we were able to fit 1L flasks into the back sleeves on the large and extra-large sizes. In the small/medium, they will not fit.
The front sleeves on all sizes are too small for 1L flasks.
Based on our testing, we were able to fit 1L flasks into the back sleeves on the large and extra-large sizes. In the small/medium, they will not fit.
The front sleeves on all sizes are too small for 1L flasks.
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6/16/2026
Does this flask (UltrAspire Locking Cap Softflask) work with a Katadyn
BeFree filter? It is 42mm
BeFree filter? It is 42mm
6/16/2026
Hey Tim,
These flasks will work with the BeFree filter!
These flasks will work with the BeFree filter!
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