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INOV-8 SOFT FLASKS

Inov-8 soft flasks include two 500ml options and a compact 250ml bottle. Choose between a locking-cap 500ml flask, a 500ml version with a long drinking tube, or the smaller 250ml flask for reduced capacity and compact storage.

The main differences are capacity and how you prefer to drink while running. The long-tube version extends the drinking position above a vest pocket, while the locking-cap model provides a secure shut-off for carrying hydration.

Need help choosing? See our Inov-8 soft flask guide ›
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Inov-8 Soft Flask 0.5L Locking Cap Inov-8 Soft Flask 0.5L Locking Cap

500ml collapsible flask with a twist-locking cap that shuts off flow to the bite valve, providing extra reassurance against leaks inside a vest or belt.
Capacity: 500ml · Weight: ~51g
Valve: High-flow locking valve

Price: £19.80
Inov-8 Soft Flask 0.5L with 10 inch Tube Inov-8 Soft Flask 0.5L with 10 inch Tube

500ml soft flask with a removable 250mm drinking tube, allowing fluid to be reached from a vest pocket without repeatedly removing the bottle.
Capacity: 500ml · Weight: ~70g
Straw: 250mm removable

Price: £22.50
Inov-8 Soft Flask 0.25L Inov-8 Soft Flask 0.25L

Compact 250ml collapsible flask for carrying supplementary water, sports drink or gel in smaller vest, waist-pack or clothing pockets.
Capacity: 250ml · Weight: 25g
Opening: 28mm

Price: £14.40
   
 
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Choosing an Inov-8 soft flask

The Inov-8 range is straightforward: choose the capacity you need, then decide whether a locking cap or extended drinking tube is more useful for your carrying setup.

Which Inov-8 500ml soft flask should I choose?

Choose the 0.5L Locking Cap version if secure shut-off is your priority. Choose the 0.5L with 10 Inch Tube if you want the drinking valve positioned higher above the vest pocket without repeatedly removing the flask.

Both provide the same nominal 500ml capacity, so the practical decision is mainly how you prefer to access your drink while running.

When should I choose the 250ml Inov-8 soft flask?

The 250ml flask suits smaller pockets or situations where you only need supplementary fluid, sports drink or concentrated nutrition. It can also be useful when you want to divide different drinks between smaller containers rather than carry another full 500ml flask.

Inov-8 at Ultramarathon Running Store

We stock Inov-8 soft flasks in the UK, with orders dispatched from Bristol. If you're unsure which capacity or drinking setup suits your vest or pack, get in touch.

For wider advice on flask capacity, vest compatibility, openings and hydration carrying strategies, see our running bottle and soft flask guide.