Rab
Rab Mythic Ultra -6°C Sleeping Bag | Ultralight Down Sleeping Bag for High Mountains
Rab Mythic Ultra -6°C Sleeping Bag | Ultralight Down Sleeping Bag for High Mountains
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- 🚚 Fast delivery: 24–48h or special order (~10 days)
- 🏔️ Expert mountain advice
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- 📍 Physical store in Madrid (El Rastro)
Technical specifications
Type
Saco de dormir de pluma ultraligero
Materials
Relleno de 900FP European goose down con acabado hidrofóbico fluorocarbon-free (355 g). Tejido exterior 10D Pertex® Quantum ripstop con fluorocarbon-free DWR. Forro 10D Recycled Atmos™ con Thermo Ionic Lining Technology (TILT).
Outer fabric
Pertex Quantum
Total weight
700 g
Main technology
Pertex Quantum
Features
Cremallera 1/2 con bafle aislante, saco de compresión ligero, funda de almacenaje con base resistente al agua.
Temperatures (ISO EN 23537)
Description
The Rab Mythic Ultra -6°C / 20F is an ultralight down sleeping bag designed for mountain activities where weight, compressibility, and thermal efficiency must be at the highest level. It is a piece clearly oriented toward fast alpinism, technical traverses, fastpacking, and outings where every gram in the pack counts.
Its combination of 900FP European goose down, L.O.F.T 3D™ construction, and a lining with TILT technology allows it to offer an outstanding warmth-to-weight ratio within the Rab range. The result is a highly technical bag with minimal volume and a very high level of thermal protection for its weight.
Real technical performance
The Mythic Ultra -6°C is designed for users who seek premium performance without extra weight. The L.O.F.T 3D™ construction uses helical baffles that help keep the down distributed evenly, reducing migration and improving thermal efficiency in real-world use.
The TILT lining helps reflect body heat and minimize radiant heat loss, maximizing the performance of its 355g of 900FP down. Compared to a more robust bag like the Neutrino, the approach here is more radical: less volume, less weight, and maximum efficiency for moving fast in cold conditions.
Quantitative technical specifications
- Total weight: 700 g / 1 lb 8.69 oz
- Fill: 900FP European goose down with fluorocarbon-free hydrophobic finish (355 g / 12.5 oz)
- Outer fabric: 10D Pertex® Quantum ripstop (26 g/m²) with fluorocarbon-free DWR
- Lining: 10D Recycled Atmos™ (28 gsm) with Thermo Ionic Lining Technology (TILT)
- Comfort temperature: 0°C / 32°F
- Limit temperature: -6°C / 21°F
- Extreme temperature: -24°C / -11°F
- Packed size: 18 cm x 30 cm (7.1 in x 11.8 in)
- Shape: tapered mummy
- Product code: QSN-25
Range comparison
Within the Mythic Ultra family, this model sits at the midpoint between the Mythic Ultra 0°C and the Mythic Ultra -12°C. Compared to the 0°C, it provides a greater thermal margin for high-altitude activities or colder bivouacs, while compared to the -12°C, it reduces weight and volume for those who do not need as much protection.
Compared to the Neutrino family, the Mythic Ultra -6°C offers a proposal more oriented toward premium ultralightweight. It is less of an "all-rounder" in approach, but clearly superior in compressibility and warmth-to-weight efficiency for users who prioritize moving fast.
Recommended use
- Light alpinism and fast outings in cold conditions
- Technical fastpacking and lightweight traverses
- High-mountain bivouacs with a fast & light focus
- Experienced users looking for maximum performance at the lowest weight
Is it for you?
Yes, if you are looking for a highly technical, very compressible down bag with an outstanding warmth-to-weight ratio. Yes, if you do fast mountain activities, alpinism, or fastpacking and need to reduce gear weight to the absolute minimum. No, if you prioritize more versatile use, a less radical construction, or a bag with more room for general intensive use; in that case, a Neutrino might be a better fit.
