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The pinnacle of Rab’s new sleeping bag range, built for efficient warmth with minimal weight
Rab says:
Every detail of the Mythic has been designed to reduce weight and bulk, drawing on over 40 years of hard-won expertise. It’s filled with high-quality 900FP down, which offers superb warmth for its weight, in our groundbreaking L.O.F.T 3D™ construction. This unique technology uses twisted, helix-shaped baffles to create funnel points within the bag, which prevent down from migrating and keep it evenly distributed. Combined with a TILT lining that reflects heat back towards your body, this allows us to achieve an unrivalled warmth-to-weight ratio. Light on grams but not on functionality, the Mythic is finished with a Pertex® Quantum ripstop fabric to ensure it stands up to mountain environments. Ultralight, stripped-back, and highly packable, it’s ideal for your fast-moving spring missions.
Our Verdict
The Rab Mythic 0C / 32F is a highly focused ultralight sleeping bag that prioritises thermal efficiency and packability. At 519g, it sits at the very light end of the market, making it well-suited for fast-moving three-season use in milder conditions. The TILT lining reflects radiant body heat towards you, helping retain warmth without adding bulk. At the same time, the L.O.F.T 3D baffle construction uses a twisted structure to keep the down evenly distributed and reduce cold spots. Sidewall baffles slightly increase internal space and help maintain loft during movement, a benefit noticeable to side sleepers.
The short zip keeps weight to a minimum, though it limits heat dumping from the legs when temperatures are higher. The cut is slim but well-shaped, with a secure hood and collar that hold warmth effectively.
- Reviewed by Ultralight Outdoor Gear
Features
- 10D Pertex® Quantum allows for greater loft and packability
- TILT lining helps to reflect and reduce heat loss
- Weight-saving L.O.F.T 3D™ baffle technology reduces down migration, optimising heat retention and reducing pack size
- Sidewall baffle construction for increased down loft and greater side sleeping comfort
- Anatomically fitted hood with drawcord adjustment to maximise comfort and heat retention
- Internal cordlocks positioned below the collar bone for greater side sleeping comfort
- 3D shaped down-filled neck collar
- 1/8 length YKK® 3 coil main zip with down-filled baffle to trap warmth
- Anatomically shaped foot box for relaxed sleeping posture
- Lightweight dry bag compression stuff sack
- Zipped storage sack with water-resistant base for home storage
- Hand-filled in Derbyshire UK
- Tapered mummy shape
- Temperature rated in accordance with ISO 23537-2:2022
Specifications
Temperature Rating
- Comfort: 5°C
- Comfort Limit: 0°C
- Extreme: -7°C
Regular
- Weight: 519g
- Lenth: 215cm
- Width: 80cm
Long
- Weight: N/A
- Lenth: 230cm
- Width: 80cm
Material & Construction
- 10D Pertex® Quantum ripstop (26g/m²) with fluorocarbon-free DWR
- 10D Recycled Atmos™ (28gsm) with Thermo Ionic Lining Technology (TILT)
- 900FP European goose down with Grangers fluorocarbon-free hydrophobic finish (187g / 6.6oz)
- 100% Woven Polyamide Shell , Down filled sleeping bag
