Jetboil
Jetboil Flash 1.0L Fast Boil System (carbon)
- Weight: 6/10 How much it adds to your pack.
- Fuel use: 9/10 How much fuel it burns to boil a litre in calm air: less fuel to carry.
- Boil speed (calm air): 7/10 How fast the maker says it boils 1 litre in calm air.
Solo or two-person three-season wild camps where most cooking is boiling water for drinks and freeze-dried meals
- Fuel
- Gas
- Weight
- 371 g
- Pot size
- 1 L
- Boil 1 L, calm air
- 4:00
- Fuel per litre
- 10 g
Packed size 19.1 cm long and 10.8 cm across Compare with a 2-litre bottle
Shorter than a 2-litre bottle and about as wide as one. Drawn to scale.
Where to buy
Wildbounds £119.95 In stock. Free delivery. Shop shows a list price of £149.95. Free UK delivery over £50. The page does not state the model year.
View at shop: WildboundsUltralight Outdoor Gear £149.99 In stock. Free delivery. List price £159.99.
View at shop: Ultralight Outdoor GearJetboil £159.99 Out of stock. Free shipping over £50.
View at shop: JetboilPrices 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
From maker's figures 6/10How much it adds to your pack. 6: A bit better than average.
371 g, the figure Jetboil's UK page gives (Jetboil's system weights leave out the 27 g canister stabiliser, as on the Zip) and We Are Explorers' spec box repeats. Ultralight Outdoor Gear lists 394 g and Live for the Outdoors 398 g. All sit in the 350-449 g band.
Fuel use
From maker's figures 9/10How much fuel it burns to boil a litre in calm air: less fuel to carry. 9: Among the best you can buy for this.
Jetboil says 10 litres per 100 g canister (Ultralight Outdoor Gear's spec table), which is 10 g per litre, under the 11 g line.
Boil speed (calm air)
From maker's figures 7/10How fast the maker says it boils 1 litre in calm air. 7: Better than most.
Jetboil's figure is 120 s for 0.5 litre (average over the life of a can), scaled to 240 s for 1 litre (scaled), in the 210-269 s band. Switchback Travel, Live for the Outdoors and We Are Explorers each give it as Jetboil's claim, and Ultralight Outdoor Gear prints it in Jetboil's own spec wording; Jetboil UK's page says only 100 s with no volume, so we use the slower 120 s. We Are Explorers timed 2 min 5 s for 0.5 litre in shelter and Switchback Travel timed 4 min for 1 litre.
What reviewers say (out of 10)
Ratings marked * are from reviews and are not part of the trip score. They are reviewers' scores, not our own measurements. How we score
Wind performance*
Reviewers' average 7/10How well it keeps boiling in a breeze.
7 reviews on wind performance, e.g. "Thanks to the classic integrated pot design, the burner is largely shielded from gusts.".
Simmer control*
Reviewers' average 5/10How low the flame turns down without going out, for real cooking.
7 reviews on simmer control, e.g. "Like most of the other integrated canister stoves, the Flash does not simmer particularly well.".
In short
Good for
- Solo or two-person three-season wild camps where most cooking is boiling water for drinks and freeze-dried meals
- Walkers who want a quick, simple one-pot system with a built-in igniter and a colour-changing heat indicator
- Trips where 1 litre of water at a time suits the group, on sheltered or moderately breezy pitches
Strengths
- Jetboil quotes 120 s for 0.5 litre; We Are Explorers timed 2 min 5 s for 0.5 litre and Switchback Travel 4 min for 1 litre
- 10 g of fuel per litre boiled (10 litres per 100 g canister)
- Twist-and-light igniter, heat-indicator cosy and a rubberised base grip
- Burner, stabiliser and a 100 g canister pack inside the 1 litre pot (packed 10.8 x 19.05 cm)
Weaknesses
- 371 g is heavier than the lighter one-person systems, and the packed height is a tall 19 cm
- Poor at simmering: Outdoor Gear Lab scores simmering 5.7 of 10, so it is for boiling water, not cooking
- Fuel use falls by about 25% in wind (Outdoor Gear Lab), and Switchback Travel notes it is still susceptible to wind, cold and altitude
- LFTO lists 'not the most stable' as a drawback
- No regulator, so output drops in cold weather; Jetboil does not rate it for winter use
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.
ShowHide sources (12)
- Ultralight Outdoor Gear: Jetboil Flash 1L page (specification table)
- Outdoor Gear Lab: Jetboil Flash review
- Switchback Travel: Jetboil Flash 1.0L stove review
- Live for the Outdoors: Jetboil Flash 1.0 camping stove review
- We Are Explorers: Jetboil Flash 1L Fast Boil System reviewed and tested
- Jetboil UK: Flash 1.0L product page
- The Great Outdoors (TGO): Jetboil Flash 1.0L Cooking System review (Chris Townsend; tested in the Cairngorms in winter 2025)
- CleverHiker: Jetboil Flash Cooking System review (Brett Kretzer; page last updated 25 March 2025 for the new Flash, first published 2019 for the old one)
- SectionHiker: Jetboil Flash 1.0L stove system review (Philip Werner; Jetboil donated the stove)
- Treeline Review: Jetboil Flash 1.0 L Fast Boil System review, tested (Liz Thomas; boiled side by side with the previous Flash)
- Advnture: Jetboil Flash 1.0 review (Julia Clarke; used on a backpacking trip; says it was not tested in especially windy conditions)
- UKC Gear: Jetboil Flash 1.0L, the classic fast boil stove just got better (Tim Hill; brand-supplied sample)