Alpine 400 Down Sleeping Bag (-5C)
This tapered, 650FP duck down bag is built for lightweight mountain adventures. Ideal for spring conditions, it's designed for alpinism, mountaineering, trekking, bike or backpacking. It has a wind resistant Pertex® Quantum outer and offers excellent value.
How it Performs
What It's Best For


Pertex® Quantum
A soft, lightweight, windproof fabric that encourages insulation to fully loft. Highly packable and protective, it's ideal for mountain activities.


Pertex® Quantum
A soft, lightweight, windproof fabric that encourages insulation to fully loft. Highly packable and protective, it's ideal for mountain activities.




Fill Power - 650
Fill power is all about down quality, not quantity. Find out more about what fill power means for you when you're out in the mountains in cold conditions.




Fill Power - 650
Fill power is all about down quality, not quantity. Find out more about what fill power means for you when you're out in the mountains in cold conditions.




Rab Sleep Limit Explained
Need help choosing the right bag for your next adventure? This is our real-world assessment of a sleeping bag's usable temperature limit. Find out how we arrive at this rating and how you can use it to select your bag.




Rab Sleep Limit Explained
Need help choosing the right bag for your next adventure? This is our real-world assessment of a sleeping bag's usable temperature limit. Find out how we arrive at this rating and how you can use it to select your bag.


Alpine Collection
Our Alpine range is built for altitude, whether you’re high in the Alps or deep in the Himalaya. Slim fitting, lightweight and duck down filled, it balances comfort with packability for hut-to-hut missions, mountain treks or bike and backpacking.


Alpine Collection
Our Alpine range is built for altitude, whether you’re high in the Alps or deep in the Himalaya. Slim fitting, lightweight and duck down filled, it balances comfort with packability for hut-to-hut missions, mountain treks or bike and backpacking.




RDS Certified Down
The Responsible Down Standard independently certifies down against animal welfare requirements and tracks it from the source to the final product.




RDS Certified Down
The Responsible Down Standard independently certifies down against animal welfare requirements and tracks it from the source to the final product.


Fluorocarbon-Free DWR
A durable water repellent coating made without harmful fluorocarbons, that encourages water to bead and roll off the garment, keeping you dry. Find out more about why we're cutting out fluorocarbons from our gear.


Fluorocarbon-Free DWR
A durable water repellent coating made without harmful fluorocarbons, that encourages water to bead and roll off the garment, keeping you dry. Find out more about why we're cutting out fluorocarbons from our gear.
Tell Me More
The Specifics
- Rab Sleep Limit:Rab Sleep Limit: -5°C (25°F)
- Weight:(Regular) 840g/29.6oz, (Long) 890g/31.4oz
- EN (13537:2012) Temperature rating:ISO EN: Comfort: -1°C (30°F), Limit: -7°C (19°F), Extreme: -25°C (-13°F)
- Product Code:QSD-27
- 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 (400g / 14.1oz)
- 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 3/4 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
- Outer: 100% polyamide. Lining: 100% recycled polyamide
- Tapered Mummy Shape
Sleeping Bag Size Guide

Tapered Mummy | Regular | Long |
---|---|---|
Sleeping Bag Length | 215cm / 84.6 in | 230cm / 90.6 in |
Max User Height | 185cm / 72.8 in | 200cm / 78.7 in |
Internal Shoulder Girth | 160cm / 63.0 in | 162cm / 63.8 in |
Internal Hip Girth | 134cm / 52.8 in | 136cm / 53.5 in |
Internal Foot Girth | 102cm / 40.2 in | 104cm / 40.9 in |
Pack Size | 35cm x 20cm | 35cm x 20cm |