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Restrap

Soft Flask (0.5 Litres)

Suits a trail runner or long-distance cyclist who carries drinks in a vest or jersey pocket.

British brand

Where to buy

We do not sell this. These are the shops where we checked it, by country. Prices change; the shop's page is always the final word.

Sold to: United Kingdom. We may earn a commission if you buy through these links. How we make money

Why it made our lists

  • Gifts for fitness lovers

    For a trail runner or long-distance cyclist who carries drinks in a vest pocket. It folds small when empty and the bite valve locks. Fiddly to clean inside and not for hot drinks.

  • Gifts for runners

    A collapsible 500ml flask with a bite valve for a trail runner who carries water in a vest pocket. It folds small when empty. Fiddly to clean inside and not for hot drinks.

What it is

A 500ml collapsible soft bottle with a twistable angled bite valve and a locking nozzle. Made of flexible MPE, it folds small when empty and fits running and cycling vest pockets. From Restrap in Yorkshire.

A collapsible 500 ml water bottle made of flexible plastic, sized for the front pocket of a running or cycling hydration vest or the back pocket of a jersey. You drink by biting a twistable, angled valve, and a locking nozzle stops leaks when it is stowed. Because it shrinks as you drink, there is no sloshing, and when empty it rolls up small. It is light, at under 40 grams, and makes it easy to see how much you have drunk or to carry mixed sports drink.

The details

Capacity
500 ml
Material
MPE, collapsible
Valve
Twistable, angled bite valve with locking nozzle
Fit
Restrap hydration vests and jersey pockets
Weight
About 38 g listed
Warranty
2 years against defects

From the shop's product page, read October 3, 2026.

Worth knowing

Soft flasks are fiddly to clean inside and are not meant for hot drinks.

Skip it for a rider who carries water only in bike bottle cages, since it is shaped for vest and jersey pockets.

Good for
Friend, Partner, Brother or sister, Coworker, Teen (13–17)
Interests
Running, Cycling, Fitness, Outdoors & camping
Occasions
Christmas, Birthday, Stocking stuffers, Secret Santa

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