Rab Mythic Ultra -6°C Sleeping Bag | Ultralight Down Sleeping Bag for High Mountains

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 clearly geared towards fast alpinism, technical traverses, fastpacking, and trips where every gram in the backpack counts.

Its combination of 900FP European goose down, L.O.F.T 3D™ construction, and a liner with TILT technology allows it to offer an outstanding warmth-to-weight ratio within the Rab range. The result is a very technical bag, with minimum volume and a very high level of thermal protection for its weight.

Real Technical Performance

The Mythic Ultra -6°C is designed for users seeking premium performance without extra weight. The L.O.F.T 3D™ construction uses helical baffles that help keep the down evenly distributed, reducing migration and improving thermal efficiency in real-world use.

The liner with TILT 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 a 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
• Liner: 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
• Compressed size: 18 cm x 30 cm (7.1 in x 11.8 in)
• Shape: tapered mummy
• Product code: QSN-25

Comparison within the range

Within the Mythic Ultra family, this model sits in the middle ground between the Mythic Ultra 0°C and the Mythic Ultra -12°C. Compared to the 0°C, it provides 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 towards premium ultralightness. It is less "all-rounder" in its approach but clearly superior in compressibility and warmth-to-weight efficiency for users who prioritize moving fast.

Recommended Use

• Lightweight alpinism and fast trips in cold conditions
• Technical fastpacking and lightweight traverses
• High mountain bivouac with a fast & light approach
• Experienced users seeking maximum performance with minimum weight

Is it for you?

Yes, if you are looking for a very technical, highly compressible down sleeping bag with an outstanding warmth-to-weight ratio. Yes, if you do fast mountaineering, alpinism, or fastpacking and need to minimize the weight of your gear. No, if you prioritize a more versatile use, a less radical construction, or a bag with a greater margin for general intensive use; in that case, a Neutrino might be a better fit.