Best Mythic Ultra 180 Down Sleeping Bag Down Sleeping Bags

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UOG TOP PICK—The Mythic Ultra 180 redefines ultralight warmth. Using our ground-breaking heat-reflective Thermo Ionic Lining Technology, this is premium protection for those counting every last gram. A stand-out choice for any gram counter

Rab says: 

Designed and constructed by our in-house technicians on the back of 40 years of hard-won mountain expertise, the award-winning Mythic Ultra 180 is one of the world’s most advanced lightweight sleeping bags.

Though constructed with a lightweight recycled 10D outer and filled with high-loft 900FP down, the really special part is the inner lining. This incorporates world-first Thermo Ionic Lining Technology (TILT), which adds a titanium coating to the fibres to reflect heat back towards your body, enabling it to significantly boost warmth without increasing weight, compromising breathability, or sacrificing any features.

Weighing just 440g, the stripped back insulation of our TILT-equipped Mythic Ultra 180 is the ultimate expression of performance without penalty.

Our Verdict

Ultralight backpackers who don’t want to compromise warmth should check out Rab’s Mythic Ultra 180, which is a game-changing sleeping bag. Weighing 450g , this mummy bag punches far above its weight class thanks to Rab’s innovative Thermo Ionic Lining Technology (TILT). The TILT inner lining has a titanium coating that reflects body heat back towards you, significantly boosting thermal efficiency without adding bulk or inhibiting breathability.

In addition to the heat-reflecting properties, the Mythic Ultra 180 incorporates other weight-saving construction details like 10D recycled ripstop nylon fabrics and 900-fill power hydrophobic down insulation. The ergonomic design features a contoured foot box, fitted hood, and differentiated zones of insulation to maximise warmth where you need it most. Despite its minimalist materials, the bag doesn’t sacrifice functionality, and amenities like anti-snag zipper tracks, an insulated collar, and a compression stuff sack are included. For ounce-counters searching for a premium lightweight bag, it’s hard to beat the space-age technology and sub-pound weight of Rab’s award-winning Mythic Ultra 180.

– Reviewed by Ultralight Outdoor Gear

Features

• Weight saving baffle construction, preventing down shift/migration
• Trapezoidal boxwall construction, to maximise loft and warmth
• Proportionally designed differential cut
• Anti snag bonded zip guard
• Ergonomically designed internal collar and hood
• Angled foot box for relaxed sleeping posture
• 1/8 length YKK® 3 coil main zip with noctilucent puller
• Lightweight dry bag compression stuff sack

Specifications

• Regular weighs: 450g (excluding storage bags)
• Long weighs: NA
• Sleeping Bag Length: (reg) 215cm / 84.6in, (long) 230cm / 90.6in
• Max User Height: (reg) 185cm / 72.8in, (long) 200cm / 78.7in
• Internal Shoulder Girth: (reg) 160cm / 63.0in, (long) 162cm / 63.8in
• Internal Hip Girth: (reg) 134cm / 52.8in, (long) 136cm/53.6in
• Internal Foot Girth: (reg) 102cm / 40.2in, (long) 104cm / 40.9in
• Rab Sleep Limit: 0°C (32°F)
• ISO EN: Comfort: 7°C, Limit: 2°C, Extreme: -12°C
• Packed Size: (reg) 32 x 16cm / 12.6 x 6.3 inch

Material & Construction

• 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 (180g/6.3oz)

Help & advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• About Rab
• Rab Mythic Sleeping Bag Range Explained
• Rab Sustainability and Responsibility
• Down Quality
• All About Down
• Hydrophobic Down
• Recycled Content in Outdoor Gear