Rab
Rab Alpine Down Sleeping Bag (0°C), 2026 model
Best use
- Made for
- Backpacking and wild camping
- Not for
- Winter mountain
Why these labels
- Backpacking and wild camping: The maker states this use, and the published specs do not rule it out.
- Winter mountain: Comfort rating 5 °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: 4/10 UK hills in spring and autumn. Wind, rain, and nights near freezing. Capped at 4: needs warmth 7+ (comfort 0 °C or colder).
- 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: 7/10 How much it adds to your pack, compared with the whole market.
Comfort 5 °C, limit 0 °C (ISO 23537).
Spring to early autumn camps in the UK, on sheltered pitches with nights above about 5 °C
- Comfort
- 5 °C
- Limit
- 0 °C
- Fill
- 650 fill down
- Weight
- 870 g (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
Alpinetrek £217.46 In stock. Free delivery.
View at shop: AlpinetrekUltralight Outdoor Gear £244.99 In stock. Free delivery.
View at shop: Ultralight Outdoor GearRab £290 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 5/10How cold a night you can sleep comfortably through. 5: Does the job. Average for wild-camping gear.
Rab's ISO 23537 comfort 5 °C (limit 0 °C, extreme -15 °C) sits in the 0.1 to 5 °C band. The maker's figure, not re-tested. Rab names the bag by its limit figure, which is the colder one.
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 7/10How much it adds to your pack. 7: Better than most.
Rab lists 870 g for the Regular, in the 700-999 g band. Ultralight Outdoor Gear lists 884 g, the same 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 only two figures, 20 cm x 35 cm, so it is a stuff sack: 3.1416 x 10 x 10 x 35 = 10,996 cm3, 11.0 L, in the 9-12.9 L band.
In short
Good for
- Spring to early autumn camps in the UK, on sheltered pitches with nights above about 5 °C
- Backpackers who want a slim down bag under 900 g
Strengths
- 870 g for the Regular, in the 700-999 g band
- 285 g of 650 fill power duck down with a fluorocarbon-free hydrophobic finish
- Slim tapered cut with sidewall baffles; the 3/4-length two-way zip lets you vent
Weaknesses
- ISO comfort is 5 °C, so it is a summer and shoulder-season bag: the 0 °C in its name is the limit figure
- Packs to about 11 L, the same stuff sack size as the much warmer Neutrino -12
- A close fit: Rab sells it only in Regular and Long
- No independent review of this 2026 bag found, so Damp, Comfort and Durability are estimates, not reviewed scores
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.