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Filling a flask mid-run shouldn't cost you a minute. This 500 ml wide-mouth soft flask opens up wide for quick refills and settles into the pockets of running vest-style packs without shifting around.
The body is 0.25 mm clear TPU film, pinch-welded and finished with a proprietary tapered pinch-weld bottom that suits short, wide vest pockets while keeping weight low and the whole thing flexible. Drinking is handled by a 42 mm nozzle with an oval flange and a 42 mm non-locking bite-valve cap; the silicone-sheathed high-flow bite valve seals itself after every sip, so drips and leaks don't happen.
As you drink, the flask compresses and the slosh fades. Empty, it packs down small.
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