Rab
Rab Alpine -6C down sleeping bag
Where it fits
- Also works for
- Backpacking and wild camping
- Not for
- Winter mountain
Why these labels
- Backpacking and wild camping: Light to carry: 1.1 kg
- Winter mountain: Comfort rating 0 °C: too cold for winter nights
From the maker's stated use and the published specs.
- Summer wild camp: 5/10 UK, roughly May to September, nights above about 8 °C, sheltered pitches.
- Three-season hills: 6/10 UK hills in spring and autumn. Wind, rain, and nights near freezing.
- Winter camp: 4/10 UK winter or high ground. Below freezing, strong wind, possibly snow. Capped at 4: needs warmth 9+ (comfort -5 °C or colder).
- Weight: 6/10 How much it adds to your pack, compared with the whole market.
Comfort 0 °C, limit -6 °C (ISO 23537).
Lowest price we found
£269.99 at Ultralight Outdoor Gear
Go to Ultralight Outdoor Gear Compare 3 shopsThree-season UK camping from spring to late autumn, down to about 0 °C with a decent mat
- Comfort
- 0 °C
- Limit
- -6 °C
- Fill
- 650 fill down
- Weight
- 1.1 kg (Regular)
Packed size 11 L, 35 cm long and 20 cm across Compare with a 2-litre bottle
A bit longer than a 2-litre bottle and about twice as wide. Drawn to scale.
Where to buy
Ultralight Outdoor Gear £269.99 In stock. Free delivery. Free UK delivery over £15.
View at shop: Ultralight Outdoor GearAbsolute Snow £284.95 In stock. Free delivery. Free delivery over £100.
View at shop: Absolute SnowRab £320 In stock. Free delivery.
View at shop: RabPrices 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
Warmth
From maker's figures 7/10How cold a night you can sleep comfortably through. 7: Better than most.
Rab's ISO 23537-1:2022 comfort figure is 0 °C (limit -6 °C, extreme -24 °C), which sits in the -4.9 to 0 °C band. The maker's figure, not re-tested.
Room inside
Estimate from maker's specs: maker's shoulder girth (fewer than 3 reviews about room) 6/10How much room to move, bend your knees and sleep on your side. Roomier is comfier. 6: A bit better than average.
No review we found says how roomy it is, so this is an estimate from the maker's shoulder girth.
Weight
From maker's figures 6/10How much it adds to your pack. 6: A bit better than average.
1,100 g for the Regular sits in the 1,000-1,299 g band.
Packed size
From maker's figures 3/10How much room it takes in your rucksack. 3: Below average. Fine for some trips, not others.
Rab gives 35 x 20 cm packed and no litres. Working that roll as a cylinder gives 3.1416 x 10 x 10 x 35 = 10,996 cm3, about 11.0 L, in the 9-12.9 L band.
In short
Good for
- Three-season UK camping from spring to late autumn, down to about 0 °C with a decent mat
- Backpackers who want a slim, windproof-shelled down bag with a UK-made fill
- Campers who add layers or a liner for the odd night near -6 °C
Strengths
- ISO 23537 rated: comfort 0 °C, limit -6 °C
- 650-fill European duck down (480 g) with a fluorocarbon-free water-repellent finish, hand-filled in the UK
- Pertex Quantum shell is windproof; baffles are shaped to stop the down shifting
- Two-way 3/4-length zip with an anti-snag guard, and a synthetic-filled collar
- Rab backs it with its Rab Promise warranty and repair service
Weaknesses
- Packs to about 11 L (35 x 20 cm), bulky for a 1,100 g down bag, so it takes a lot of a small rucksack
- Slim-fitting cut: restless sleepers and broad shoulders may find it tight
- Comfort 0 °C is the maker's figure for a standard woman sleeping relaxed, so cold sleepers need layers near freezing
- No independent test of this bag yet, so damp performance, comfort and durability are estimates, not reviewed scores
- Listings disagree on weight (1,100 g to 1,110 g)
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.