# On Running Soft Flask 0.5l

**Brand:** ON
**Category:** Sport & fitness
**Code (GTIN/SKU):** 7615537125305
**Canonical URL:** https://openreviews.io/en/reviews/on/on-running-soft-flask-0-5l-7615537125305

## Rating: 4.8/5 ★★★★★ — 12 reviews analyzed
_Confidence: high_

## At a glance

On Running Soft Flask 0.5l reviews: 4.8/5 based on 12 analyzed reviews, updated October 12, 2026.

Praised: perfect compatibility and leak-proof.

12 reviews analyzed, all published on other sites.
Other sites: 1 source, 12 reviews, average rating 4.8/5.
How we count reviews: https://openreviews.io/en/methodology

## AI summary

This soft flask with a 0.5-liter capacity is specifically designed to accompany athletes during their running sessions. Users highlight that it fits optimally and smoothly into the pockets of the hydration vest from the same brand. Its perfectly leak-proof design prevents any water leakage during exercise, offering great reliability during the run.

## Strengths

- **Perfect compatibility** — The flask fits ideally and stays securely in place in the brand's hydration vest.
- **Leak-proof** — The airtight design effectively prevents liquid leaks during exercise.

## Frequently asked questions

- Is the flask compatible with other running vests?
- Is the material BPA-free and without a plastic taste?
- Is it easy to clean after use?
- Is the cap easy to use while running?

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_Source: OpenReviews — https://openreviews.io/en/reviews/on/on-running-soft-flask-0-5l-7615537125305_