Rab
Rab Radeon 0 °C Synthetic Sleeping Bag (Regular)
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).
Lowest price we found
£119.99 at Ultralight Outdoor Gear
Go to Ultralight Outdoor Gear Compare 3 shopsDamp UK nights in a tent or bothy, where synthetic fill keeps working if it gets wet from condensation
- Comfort
- 5 °C
- Limit
- 0 °C
- Fill
- synthetic
- Weight
- 960 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
Ultralight Outdoor Gear £119.99 In stock. Free delivery. Regular. This shop's page lists 1,005 g and an RRP of £139.99.
View at shop: Ultralight Outdoor GearAlpinetrek £125.96 In stock. Free delivery. Regular, left zip.
View at shop: AlpinetrekRab £140 In stock. Free delivery. Regular, left zip; the Long is £150.
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 figure is 5 °C (limit 0 °C, extreme -15 °C), in the 0.1 to 5 °C band. The 0 °C in the name is the limit figure, not the comfort figure.
Room inside
Estimate from maker's specs: bag shape (fewer than 3 reviews about room) 5/10How much room to move, bend your knees and sleep on your side. Roomier is comfier. 5: Does the job. Average for wild-camping gear.
No review we found says how roomy it is, so this is an estimate from the bag shape.
Weight
From maker's figures 7/10How much it adds to your pack. 7: Better than most.
Rab gives 960 g for the Regular, in the 700–999 g band. One UK shop lists 1,005 g for the same bag; at that weight it would sit 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 only two figures, 35 x 20 cm, so it's a stuff sack and we take the smaller one as the width: 3.1416 x 10 x 10 x 35 = 10,996 cm³, so 11.0 L, in the 9–12.9 L band.
In short
Good for
- Damp UK nights in a tent or bothy, where synthetic fill keeps working if it gets wet from condensation
Strengths
- Synthetic fill, so it is not harmed by damp the way down is
- ISO 23537 comfort 5 °C and limit 0 °C, tested to the current standard
- Sidewall baffles and a 3/4-length two-way zip give more room and venting than a close-fitting mummy
- Shell is a windproof, water-resistant 20D recycled polyester
Weaknesses
- Heavy and bulky for its warmth: 960 g and about 11 L packed, against 500 g and 6 L for the Rab Mythic with the same ratings
- The 0 °C in the name is the limit rating; the comfort rating is 5 °C, so cold sleepers will want a warmer bag
- No independent reviews yet, so damp performance, comfort and durability are 'Not enough evidence'
- Weight differs between sources (960 g from Rab, 1,005 g from a UK shop)
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.