Rab Sleeping Bag Guide
Jan 26, 2026
Mythic Ultra
Built from lightweight recycled 10D Atmos™, it uses Thermo Ionic Lining Technology (TILT) to coat the fibres with titanium, helping reflect radiant heat back towards your body without compromising the fabric’s breathability. While that reduces the amount of down required for a given level of warmth, the angles of the bag’s trapezoidal boxwall construction also improve the evenness of down distribution, eliminating cold spots.
Mythic
The Mythic range is all about slashing weight wherever possible. The Mythic is an extremely lightweight at home in high mountains, it’s ideal for venturing out long Alpine routes, multi-day climbs, treks, or bikepacking adventures.
The chevron style baffle design keeps the down in position, optimising core warmth and reducing the amount of fabric needed compared to traditional horizontal baffles. The outer is made from our own wind- and water-resistant, recycled 10D Atmos™ fabric. The bag has a narrow mummy shape to minimise bulk, lightweight zips and pullers, and comes with a lightweight, waterproof, roll-top compression sack for protection from the elements and a small pack size while on the move.
Radeon
Built to withstand the rigours of camping, backpacking, and trekking, this synthetic sleeping bag offers enduring warmth in changeable weather. Filled with Stratus™ insulation in a concertina-style construction, trapping air to boost loft and warmth.
Radeon 6C / 43F Synthetic Regular Sleeping Bag (Comfort Limit: 6°C & Weighs: 651g)
Women's Radeon 0C / 32F Synthetic Regular Sleeping Bag (Comfort Limit: 0°C & Weighs: 938g)
Radeon 0C / 32F Synthetic Regular Sleeping Bag (Comfort Limit: 0°C & Weighs: 1005g)
Women's Radeon -6C / 20F Synthetic Regular Sleeping Bag (Comfort Limit: -6°C & Weighs: 1203g)
Radeon -6C / 20F Synthetic Regular Sleeping Bag (Comfort Limit: -6°C & Weighs: 1293g)
Women's Radeon -12C / 10F Synthetic Regular Sleeping Bag (Comfort Limit: -12C & Weighs:
1745g)
Neutrino
Eliminating excess bulk with a highly tapered design and offering high warmth for its weight, this bag is built for fast and light mountain missions in the spring and summer. Filled with goose down and covered with a recycled, wind resistant Pertex® Quantum outer.
Intelligently baffled and a Tapered Mummy shape for an excellent warmth to weight ratio. An excellent all-round bag for trekking or fast & light in the depth of winter.
Alpine
Our Alpine range is built for the mountains, whether you’re high in the Alps or deep in the Himalaya, on foot or two wheels. Offering a good warmth to weight ratio and a low bulk design, the Alpine is perfect for mountain adventures at altitude. It is filled with duck down and covered with a wind resistant Pertex® Quantum outer with a recycled nylon lining.
Engineered to maximise down performance, the Alpine bag has clever construction. Trapezoid boxwall baffles allows the down to fully loft, eliminating cold spots, and maximising warmth. The chevron baffle design improves down stability, distributing the down evenly around the whole body. In addition, the openings on the Alpine bag have been designed to reduce heat loss, with a 3D-shaped, down collar that can be cinched in snugly to trap the heat, and a down-filled baffle along the zip to prevent heat from escaping.
Alpine 200 (Comfort Limit: 1°C & Weighs: 648g)
2026 Women's Alpine -6C / 20F Down Regular Sleeping Bag (Comfort Limit: -6C & Weighs: 1064g)
2026 Alpine -6C / 20F Down Regular Sleeping Bag (Comfort Limit: -6C & Weighs: 1110g)
2026 Alpine -12C / 10F Down Regular Sleeping Bag Comfort Limit: -12C & Weighs: 1273g)
Ascent
The Ascent is built with a lightweight and durable, recycled Pertex® Quantum outer fabric and recycled nylon lining. It has trapezoid shaped, boxwall baffles that stack neatly together, encouraging the hydrophobic duck down inside to loft fully and reducing the appearance of cold spots. Hand-filled in the UK, all our down bags benefit from never having had their down compressed before use, maintaining the down’s loft and warmth.
The generous mummy fit with wide foot box provides a spacious feel for an easy night’s sleep, and the close-fitting neck baffle keeps the heat in when the temperature drops. It has a ¾ length main zip with a down filled baffle to keep out the draught.
Ascent 300 Regular Sleeping Bag (Comfort Limit: 0°C & Weighs: 855g)
2026 Ascent 0C / 32F Down Regular Sleeping Bag (Comfort Limit: 0°C & Weighs: 934g)
2026 Women's Ascent -6C / 20F Down Regular Sleeping Bag (Comfort Limit: -6C & Weighs: 1106g)
Ascent -6C / 20F Down Sleeping Bag (Comfort Limit: -6C & Weighs: 1145g)
Ascent -18C / 0F Down Regular Sleeping Bag (Comfort Limit: -18C & Weighs: 1267g)
Ascent -12C / 10F Down Regular Sleeping Bag (Comfort Limit: -12C & Weighs: 1376g)
Women's Ascent -12C / 10F Down Regular Sleeping Bag (Comfort Limit: -12C & Weighs: 1389g)
Andes Infinium
High altitude and winter expedition sleeping bag with TILT technology for warmth in extreme conditions. Offering refuge to those exploring the world’s highest peaks and the polar regions, the Andes Infinium is packed with cutting edge tech, built to keep you warm.
The Andes Infinium is filled with ultra-high lofting 800FP, goose down. It is constructed using trapezoid shaped boxwall baffles, which stack together reducing cold spots and maximise the lofting and efficiency of the down inside. Reflecting heat towards the body, our TILT technology is seen as a silver sheen on this inside of the bag. Reducing heat loss by up to 32%, TILT substantially improves thermal insulation without compromising pack size, breathability, or weight.
Sleeping bags are where it all began for Rab, and they remain a core part of our range to this day. From ultralight sleeping bags designed for hut-to-hut trekking, to high fill power Down Bags for arctic sleeping with a limit rating of -40°C (-40°F), our collection strategically balances warmth, weight, and pack size for a range of activities. Choose from Synthetic Insulation, which offers durability and resilience in damp conditions, or Down, which delivers unbeatable warmth for weight, perfect for fast and light adventures or expedition use.