Thermos
Thermos Stainless King Flask 470 ml
- Weight for its size: 1/10 How much it adds to your pack for the water it holds.
- Packed size (empty): 1/10 How much room it takes up when it is empty, for the water it holds.
Hot soup or a brew at a camp or on a winter day walk: the wide neck takes a spoon and the lid is a bowl
- Type
- Insulated
- Capacity
- 0.47 L
- Weight
- 370 g
- Keeps hot (maker's figure)
- 18 h
Packed size 1.08 L, 24.5 cm long and 7.5 cm across Compare with a 2-litre bottle
Shorter than a 2-litre bottle and thinner than one. Drawn to scale.
Where to buy
Thermos UK £20 In stock. Delivery £3.95. Brand shop. The page text says Sold out, but its stock data shows every colour available. £3.95 standard or £6.50 next day. Free over £50.
View at shop: Thermos UKPrices 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 1/10How much it adds to your pack for the water it holds. 1: A real weak point.
Thermos UK lists 370 g for 0.47 L: 787 g per litre, in the 500 g/L and over band.
Packed size (empty)
From maker's figures 1/10How much room it takes up when it is empty, for the water it holds. 1: A real weak point.
A rigid bottle does not shrink, so we draw it as a cylinder from its height and width. Thermos UK gives 7.5 x 7.5 x 24.5 cm without labels; we read 24.5 cm as the height and 7.5 cm as the width: 3.1416 x 3.75 x 3.75 x 24.5 = 1,082 cm³, so 1.08 L empty for 0.47 L held (2.30 per litre), in the 1.8 and over band.
In short
Good for
- Hot soup or a brew at a camp or on a winter day walk: the wide neck takes a spoon and the lid is a bowl
- Car-based trips and short walks where weight is not the limit
- A budget stainless flask that Thermos backs with a 5-year guarantee
Strengths
- Thermos says it holds heat for 18 hours and cold for 24 hours (brand figure, not tested by us)
- Stainless steel inside and out, with a 5-year guarantee (Thermos)
- Wide mouth for soup; lid works as a cup or bowl (Thermos)
Weaknesses
- 370 g for 0.47 L is 787 g per litre, in the heaviest weight band
- Rigid and bulky for its size: 1.08 L of pack room for 0.47 L held
- Hot-hold hours are Thermos's own figure, not tested by us
- No independent test of this exact flask found, so ease of use and durability are estimates, not reviewed scores
- Only one UK shop checked (Thermos UK); no second shop's page could be read
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.