Engineered for deep winter and high-altitude environments, the Rab Alpine Down Sleeping Bag (-18°C) delivers serious cold-weather performance in a streamlined, packable design. Its slim, technical fit minimises internal air space, helping your body heat the bag more efficiently—ideal for exposed alpine bivis and multi-day expeditions.
Filled with 650 fill power European duck down, this bag uses advanced L.O.F.T™ baffle technology to stabilise the insulation, reducing down migration and maintaining consistent warmth throughout. By maximising thermal efficiency with less insulation, it achieves an excellent warmth-to-weight ratio while keeping pack size to a minimum.
The outer is constructed from windproof Pertex® Quantum fabric, offering lightweight protection against harsh mountain conditions. Each sleeping bag is hand-filled in the UK, ensuring the down has never been compressed before use, preserving maximum loft and insulating performance. Built for winter alpine missions, this is a dependable, low-bulk solution when temperatures drop well below freezing.
FEATURES:
- L.O.F.T™ construction uses alternating wide and narrow baffles to achieve great warmth for weight.
- Sleep comfortably on your side thanks to the sidewall baffles, which reduce cold spots and ensure you’re not lying on a seam.
- Cinch in the hood to seal in the heat, while the synthetic insulated collar sits snugly around your neck.
- Tapered mummy shape maximises comfort while minimising pack size.
- Two-way zip provides ventilation when you need it, while the insulated zip baffle prevents cold spots when the temperature drops.
- Keep valuables and essentials close at hand with a zipped internal stash pocket.
- Internal cordlocks positioned below your collar bone for greater side sleeping comfort.
- YKK® anti-snag zip insert and anti-snag internal zip guard.
- Anatomically shaped foot box allows you to sleep in a relaxed position.
- Drawcord stuff sack included.
- Zipped storage sack with water-resistant base for home storage.
- Hand-filled in Derbyshire UK.
SPECIFICATIONS:
Weight: 1550g/3lb 6.67oz
Insulation: 650FP European duck down with Grangers fluorocarbon-free hydrophobic finish (880g / 31.0oz)
Main fabric: 20D Pertex® Quantum nylon ripstop (38g/m²) with fluorocarbon-free DWR
Fabric liningLining: Recycled 20D nylon, 38g/m²
ISO (23537-1:2022) temperature ratingComfort: -10°C (14°F), Limit of comfort: -18°C (0°F), Extreme: -40°C (-40°F)
Limit of Comfort: -18°C / 0°F
Packed size: 26cm x 45cm (10.2in x 17.7in)
Product code: QSN-13
