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Images: Rab and its retailers. Used for product identification.

Rab

Rab Ascent -12 °C

Rab's workhorse winter bag: ISO -5 °C comfort with hydrophobic down.

Weight
1,350 g
Comfort
-5 °Climit -12 °C
Packed
22 × 40 cm

Best price found

£305.95

at Snow+Rock · In stock

View Deal
  • SummitsIn stock · RRP £380.00£319.99View Deal
  • RabIn stock, some sizes sold out£360View Deal

Prices checked 31 October 2026. We may earn a commission on these links.

  • 650 FP down
  • Hydrophobic down
  • Recycled fabrics

Specifications

Weight
1,350 g
Packed size
22 × 40 cm
Comfort
Comfort -5 °C / limit -12 °C
Fill
650 FP duck down, 680 g fill
Shell & construction
Outer: 20D Pertex Quantum nylon ripstop, 38 g/m²…; L.O.F.T. construction with sidewall baffles
Rating Standard
ISO 23537 rating
Fill Note
650FP European duck down with Grangers fluorocarbon-free hydrophobic finish…
Season
3-4 season / UK winter
Zip
Two-way YKK 3/4-length main zip with synthetic-filled…
Manufacturer page →

Pros & cons

  • Independently tested ISO 23537 comfort rating of -5°C, from a UK-filled bag
  • Hydrophobic down and Pertex Quantum shell suit damp UK winters
  • The roomy wide-mummy cut and side-sleeper details give space for layers
  • Heavy at 1350 g for -5°C comfort: Alpkit's PipeDream 600 is 990 g for EN comfort -10.5°C
  • Main zip is only 3/4 length

Sources for this product

  1. 1Rab UK product page
  2. 2Snow+Rock listing
  3. 3Summits listing
  4. 4Ultralight Outdoor Gear: Rab's 2026 Sleeping Bag Range

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