Montane
Montane SoftFlask 360 mL Soft Flask
- Weight for its size: 10/10 How much it adds to your pack for the water it holds.
- Packed size (empty): 8/10 How much room it takes up when it is empty, for the water it holds.
Lowest price we found
£15.99 at Ultralight Outdoor Gear
Go to Ultralight Outdoor Gear Compare 2 shopsShort hill days where a small flask in a pack strap or hip pocket is enough
- Type
- Soft
- Capacity
- 0.36 L
- Weight
- 20 g
- Packed
- Not published
Where to buy
Ultralight Outdoor Gear £15.99 In stock. Free delivery. It lists 35 g where Montane lists 20 g.
View at shop: Ultralight Outdoor GearMontane £16 In stock. Montane's own shop. Its banner and delivery page disagree on the free-delivery rule, so check the shop for the delivery cost.
View at shop: MontanePrices checked 8 Nov 2026 on each shop's own page; shops can change them. We earn no commission on these links; shops are listed by price. More
Our ratings (out of 10)
1 to 10, compared with the whole market. Each says what it's based on. How we score
Weight for its size
From maker's figures 10/10How much it adds to your pack for the water it holds. 10: The best you can buy for this.
Montane lists 20 g for 360 mL: 56 g per litre, under 100 g/L. Ultralight Outdoor Gear lists 35 g (97 g per litre), which bands the same.
Packed size (empty)
Estimate from maker's specs: soft bottle: rolls up when empty 8/10How much room it takes up when it is empty, for the water it holds. 8: Clearly better than most.
Estimate from maker's specs
In short
Good for
- Short hill days where a small flask in a pack strap or hip pocket is enough
- A light spare 360 mL for fastpacking or a trail-running vest
- Drinking on the move: soft silicone bite valve for a high flow rate (Montane)
Strengths
- 20 g for 360 mL: 56 g per litre
- Compresses as you drink, so water does not slosh (Montane)
- Wide screw-top opening for filling and cleaning, and for powders or gels
- Tapered shape and base made for small pockets
- Top-rack dishwasher safe, and BPA and PVC free (Montane)
Weaknesses
- Montane lists 20 g, Ultralight Outdoor Gear 35 g
- Montane gives no rolled-up size, so we cannot score packed size
- No independent test found, so ease of use and durability are estimates, not reviewed scores
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.