Womens Alpine 800 Down Sleeping Bag

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Rab’s Alpine range features 650 Fill Power down, housed in technical baffles and shaped into a slim, Tapered Mummy profile, to offer strong warmth-to-weight performance for backpackers and trekkers.

Rab says: 

Crafted for your high alpine adventures in cold environments, this warm duck down bag harmonises comfort and packability for winter mountaineering, hut-to-hut treks, or bikepacking at altitude. Designed with a slim-fitting, tapered mummy shape and lightweight, wind-resistant Pertex® Quantum fabric, it trims excess bulk where possible while offering you a comfortable night’s sleep in sub-zero temperatures.

The sleeping bag has a clever construction designed to maximise the performance of the 650FP European duck down and offer more heat for fewer grams. The weight-saving chevron baffle design on the upper torso helps to stop the down migrating and keep it where you need it for reliable core warmth. Generous trapezoid boxwall baffles allow the down to fully loft, trapping heat and eliminating cold spots. The bag’s openings have also been engineered to retain warmth, with a down neck collar that you can cinch in snugly and a down-filled baffle along the ¾ length main zip to prevent draughts. Stash valuables securely in the zipped internal pocket, and in between adventures, store the bag in its zipped cotton sack with a protective water-resistant base, keeping it in prime condition.

The Alpine 800 is hand-filled in the UK, and our down is never compressed before use, preserving its loft and warmth for your first mountain mission.

Our Verdict

The Alpine 800 Down Sleeping Bag features a trapezoidal boxwall baffle design with a differential cut, which helps maintain loft and minimise cold spots. While the down quality is a step below Rab’s top-tier offerings, it keeps the price more accessible without compromising on key technical features.

The Tapered Mummy shape is designed for thermal efficiency, reducing internal air movement to retain heat, ideal for weight-conscious users who prioritise packability. That closer fit may not suit everyone, but it serves a clear functional purpose.

Pertex Quantum fabric is used for the outer shell, offering reliable wind resistance without adding bulk. The rest of the build reflects Rab’s attention to detail, with excellent finishing and a refined overall design that’s well-suited for multi-day use in varied conditions.

– Reviewed by Ultralight Outdoor Gear

Features

• Rab Sleep Limit: -16°C (5°F)
• Weight saving chevron baffle design on upper torso, reduces down migration and optimises core warmth
• Trapezoidal boxwall construction with differential cut, to maximise loft and warmth
• YKK® zipped internal stash pocket
• 3-dimensional shaped down filled neck collar to seal in warmth
• YKK® ¾ length main zip with down filled baffle to trap warmth
• YKK® anti-snag zip insert and anti-snag internal zip guard
• Angled foot box for relaxed sleeping posture
• Zipped cotton sack with water-resistant base for home storage
• Drawcord stuffsack included
• Hand-filled in Derbyshire UK
• Tapered mummy shape

Specifications

• Weight: 1245g
• Rab Sleep Limit: -16°C (3°F)

Material & Construction

• 20D Pertex® Quantum nylon ripstop (36gsm) with fluorocarbon-free DWR
• Lining: 20D Recycled Nylon (38gsm)
• 650FP European Duck Down with Nikwax Fluorocarbon-Free Hydrophobic Finish (800g / 28.2oz)
• Main: 100% Polyamide. Lining: 100% Recycled Polyamide

Help & advice:

• Women’s Sleeping Bags – How do they differ?
• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• About Rab
• Rab Down Sleeping Bag Range Explained
• The EN13537 Standard
• All About Down
• Hydrophobic Down
• Responsible Down Standard
• Recycled Content in Outdoor Gear
• Rab Sustainability and Responsibility