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The Rab Mythic Ultra 120 Modular is a lightweight, warmth-efficient sleeping bag that pairs with the Ultrasphere 4.5 pad or other inflatable mattresses. It strategically places insulation where needed, eliminating unnecessary weight.
Rab says:
Ultralight bag with TILT lining and 900FP down in the upper only to achieve superb warmth for weight. Designed to be used with our Ultrasphere sleep mat to form the ultimate lightweight sleep system, ideal for thru-hiking and multi-day mountain runs.
Our Verdict
The Rab Mythic Ultra 120 Modular is an innovative ultralight sleeping bag designed specifically to pair with Rab's Ultrasphere 4.5 sleeping pad. However, it can be used with other inflatable mattresses as well. At just 345g for the bag alone, it achieves an impressive warmth-to-weight ratio by strategically placing 900 fill power ethically sourced hydrophobic down insulation where you need it most.
The upper body section and underside of the legs are insulated, while the back section has no insulation since your sleeping pad will provide that warmth. This eliminates unnecessary weight and bulk. Combined with the Ultrasphere 4.5 pad (rated to 0°C), the sleep system weighs under 700g yet keeps you comfortable with freezing temperatures.
The bag comes with a sleeve designed to accommodate the Ultrasphere sleeping pad. While most regular-sized pads may fit, wider, longer, or shorter pads may not. An elasticated fastening system to secure the pad would have addressed this issue but it is lacking.
The 10D recycled shell fabric is treated with a fluorocarbon-free DWR, and the foot box utilises Rab's heat-reflective TILT lining to boost warmth further. With a tiny compressed size, premium materials, and intelligent insulation mapping, the Mythic Ultra 120 Modular is an outstanding option for ounce counters looking to cut weight without sacrificing warmth on multi-day treks, bikepacking trips, or fast-packing missions.
- Reviewed by Basecamp Gear
Features
- Rab sleep limit of 0°C (32°F) achieved with air mats rating R4 or above
- 10D Recycled Atmos™ (27gsm) with Fluorocarbon-Free DWR
- 10D Recycled Atmos™ (28gsm) with Thermo Ionic Lining Technology (TILT)
- 900FP European Goose Down with Nikwax Fluorocarbon-Free Hydrophobic Finish (120g/4.2oz)
- TILT and 900FP down on upper bag and lower legs achieves high warmth to weight ratio
- Integrated mat sleeve secures uninsulated area of the bag to air mat
- Rab sleep limit of 0°C (32°F) achieved with air mats rating R4 or above
- diagonal zip entry with YKK® 2-way zip allows easy entry and exit, and versatile venting
- Pillow sleeve designed for folded clothing for use as a ultralight pillow
- Down-filled anti-snag zip baffle
- Lightweight roll-top compression sack included
- Filled in Derbyshire UK
- Optimally filled, lightweight stitch-through construction
Specifications
- Weight: 345g
- Packed size: 16x30cm
Material & Construction
- Main: 100% Recycled Polyamide. Lining: 100% Recycled Polyamide with Metal coating
