Lightweight synthetic
Images: Rab and its retailers. Used for product identification.
Rab
Rab Radeon Synthetic Sleeping Bag (0°C)
960 g synthetic mummy with an ISO comfort of +5 °C, from about £120 at UK specialists.
- Weight
- 960 g
- Comfort
- +5 °Climit 0 °C
- Packed
- 20 × 35 cm
Best price found
£111.95
at Absolute Snow · Pre-order · RRP £139.95
- Ultralight Outdoor GearIn stock · RRP £139.99£119.99View Deal
- AlpinetrekIn stock · RRP £139.95 · In stock (Regular, left zip)£125.96View Deal
- RabIn stock · Direct from maker£140View Deal
Prices checked 31 October 2026. We may earn a commission on these links.
- Synthetic fill
- Sidewall baffles
- Insulated collar
- Two-way zip
- Recycled fabrics
Specifications
- Weight
- 960 g (Rab figure, regular (215 cm). Ultralight Outdoor Gear lists Regular 1005 g, Long 1098 g. Product code QSS-21.)
- Packed size
- 20 × 35 cm
- Comfort
- Comfort +5 °C / limit 0 °C
- Insulation
- Recycled Stratus synthetic sheet insulation, WARM WAVE construction
- Season rating
- 2–3 season
- Shell & zip
- Outer: 20D Atmos recycled polyester ripstop, 41 gsm, fluorocarbon-free DWR. Lining: 20D Atmos recycled polyester, 38 gsm
- Rating Standard
- ISO 23537-1:2022 rating (extreme -15 °C per Rab)
- Fill Note
- Fill weight not stated by Rab. Regular fits up to 185 cm, Long up to 200 cm.
- Zip
- Two-way YKK zip with insulated baffle and anti-snag guard (3/4 length per Ultralight Outdoor Gear); left or right
Pros & cons
- Under 1 kg with a lab-tested ISO comfort of +5 °C and limit of 0 °C
- Stratus fill 'continues to insulate when damp and dries quickly' (Ultralight Outdoor Gear verdict)
- Sidewall baffles and a cut 'generous without feeling restrictive' suit side sleepers (Ultralight Outdoor Gear)
- Ultralight Outdoor Gear notes it 'sits heavier than down alternatives'
- New 2026 bag: no independent editorial review found yet, only a retailer's verdict
More synthetic bags
Full comparison →
7 photosBest valueVango
Vango Nitestar Alpha 250
A lab-tested ISO comfort rating of +2 °C for around £40, from the brand on every campsite.
- Weight
- 1.6 kg
- Comfort
- +2 °Climit -4 °C
- Packed
- Not stated by maker
- Synthetic fill
- Draught collar
- Two-way zip
Full specs, 4 retailers →View DealFrom
£39.99
at Norwich Camping & Leisure
Cheapest adult bagMountain Warehouse
Mountain Warehouse Summit 250
A roomy square bag for summer campsites and festivals, often half price.
- Weight
- 1.4 kg
- Comfort
- +5 °Climit 0 °C
- Packed
- 23 × 36 cm
- Synthetic fill
- Two-way zip
Full specs, 1 retailer →View DealFrom
£29.99
at Mountain Warehouse
7 photosWarmestVango
Vango Nitestar Alpha 350
An ISO-rated -1 °C comfort bag for under £50. Heavy at 1.9 kg, so one for the car boot, not the rucksack.
- Weight
- 1.93 kg
- Comfort
- -1 °Climit -7 °C
- Packed
- ≈ 30 × 22 cm, per Attwoolls
- Synthetic fill
- Draught collar
- Two-way zip
Full specs, 4 retailers →View DealFrom
£39.95
at Attwoolls Outdoors

