Montbell
Montbell Alpine Thermo Bottle 0.5 L
- Weight for its size: 3/10 How much it adds to your pack for the water it holds.
- Packed size (empty): 3/10 How much room it takes up when it is empty, for the water it holds.
Mountain days and winter walks where a hot drink must stay hot until the afternoon
- Type
- Insulated
- Capacity
- 0.5 L
- Weight
- 237 g
Packed size 0.82 L, 22.5 cm long and 6.8 cm across Compare with a 2-litre bottle
Shorter than a 2-litre bottle and thinner than one. Drawn to scale.
Where to buy
Ultralight Outdoor Gear £39.99 In stock. Free delivery. Comes with an insulated inner cap and a cup outer cap. Free tracked UK delivery on all orders. The only UK shop found.
View at shop: Ultralight Outdoor GearPrices 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 3/10How much it adds to your pack for the water it holds. 3: Below average. Fine for some trips, not others.
Montbell lists 237 g for 0.5 L (product 1134167): 474 g per litre, in the 300–499 g/L band, close to the line. Ultralight Outdoor Gear lists 238 g (476 g per litre, same band).
Packed size (empty)
From maker's figures 3/10How much room it takes up when it is empty, for the water it holds. 3: Below average. Fine for some trips, not others.
A rigid bottle does not shrink, so we draw it as a cylinder from its height and width. Montbell gives 22.5 cm tall and 6.8 cm across: 3.1416 x 3.4 x 3.4 x 22.5 = 817 cm³, so 0.82 L empty for 0.5 L held (1.63 per litre), in the 1.3–1.79 band.
In short
Good for
- Mountain days and winter walks where a hot drink must stay hot until the afternoon
- A light insulated bottle that can be opened with gloves on
- Anyone who wants the outer cap as a cup
Strengths
- 237 g for 0.5 L: 474 g per litre
- Montbell gives 95 °C down to 78 °C after 6 hours at 20 °C room temperature
- Insulated inner cap with a hexagonal grip, made to open with gloves on (Montbell)
- Outer cap doubles as a cup; the flip-top Active lid and a cup set are sold separately
- BPA free; stainless steel inner wall (SUS316)
Weaknesses
- 237 g for 0.5 L: 474 g per litre, over twice the weight per litre of a plastic bottle
- 0.82 L of pack room for 0.5 L of drink
- Montbell gives temperatures at 6 hours, not hours-hot, so hold time is not shown as a figure
- Bottle body and inner cap are not dishwasher-safe (Montbell)
- Montbell's own shop ships from Japan or Switzerland; Ultralight Outdoor Gear is the only UK shop found
- No independent test of this version 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.