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

Rab

Rab Mythic 0 °C

500 g of 900 FP hydrophobic down, ISO comfort 5 °C / limit 0 °C, packing to 16 × 30 cm.

Weight
500 g
Comfort
+5 °Climit 0 °C
Packed
16 × 30 cm

Best price found

£399.95

at Cotswold Outdoor · In stock, some sizes sold out · RRP £500.00 · Low stock

View Deal
  • Snow+RockIn stock, some sizes sold out · RRP £500.00 · Low stock£399.95View Deal
  • Ultralight Outdoor GearIn stock · RRP £499.99£424.99View Deal
  • RabIn stock · Direct from maker£500View Deal

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

  • 900 FP down
  • Hydrophobic down
  • Heat-reflective lining
  • Short zip
  • Hand-filled in UK

Specifications

Weight
500 g (regular; Long £520 version also sold)
Packed size
16 × 30 cm
Comfort
Comfort +5 °C / limit 0 °C
Fill
900 FP goose down, 187 g fill
Shell & construction
Outer: 10D Pertex Quantum ripstop, 26 g/m², PFAS-free DWR. Lining: 10D recycled Atmos with TILT heat-reflective lining; L.O.F.T 3D helix baffles with sidewall baffles
Rating Standard
ISO 23537 rating
Fill Note
900FP European goose down with Grangers fluorocarbon-free hydrophobic finish. Hand-filled in Derbyshire. Extreme rating -15 °C.
Season
2-3 season
Zip
1/8-length YKK zip with down-filled zip baffle
Manufacturer page →

Pros & cons

  • ISO 23537 tested at 5 °C comfort / 0 °C limit for just 500 g
  • UOG's verdict: at 519 g it 'sits at the very light end of the market'
  • Sidewall baffles add loft and help side sleepers, per Rab and UOG
  • UOG notes the short zip 'limits heat dumping from the legs' on warmer nights
  • £400–£500 is premium money; no independent field test of the 2026 bag found yet

Sources for this product

  1. 1Rab UK product page
  2. 2Ultralight Outdoor Gear listing and verdict
  3. 3Cotswold Outdoor listing
  4. 4Snow+Rock listing

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