Finding the perfect sleeping bag for high-altitude camping, mountaineering, and multi-day trekking is never an easy task. With so many brands on the market offering seemingly identical specs, the choice can be completely overwhelming. Before setting off for a demanding Himalayan adventure on the Annapurna Circuit, I was stuck weighing my options, desperate to find a bag I could trust for those freezing, uninsulated high-altitude tea houses without entirely draining my gear budget. Enter the Rab Alpine 800 Down Sleeping Bag.
It quickly proved itself as a phenomenal all-rounder, offering a brilliant balance of lightweight down insulation, water-resistant protection, and crucial comfort with an impressive sleep limit down to -16°C. In this comprehensive review, I will break down all the key specs, its biggest strengths, its hidden weaknesses, and the best alternatives to consider before you buy.
Field Note: This guide contains affiliate links. If you purchase gear through these links, I may earn a small commission at no extra cost to you. I only recommend equipment I have personally mountain-tested and trust.
Rab Alpine 800 Down Sleeping Bag – Kit Review
Overview
The Rab Alpine 800 Sleeping Bag is a tapered, 650FP Duck Down sleeping bag designed for mountain adventures. It excels in cold and winter conditions (to a certain degree) with trekking, mountaineering and backpacking the primary activities. Rab’s Alpine Range is built for mountain exploration, whether in the Alps or the Himalayas. One of Rab’s key strengths is the quality down insulation used in jackets, sleeping bags and other down products.
I already own the popular Rab Microlight Alpine Down Jacket, so I looked no further when searching for a Sleeping Bag before attempting the Annapurna Circuit, where temperatures plummet at Altitude. The Rab Alpine 800 is offered unisex with a Regular or Long version and either Left or right-hand side zips.
Rab Alpine 800 Down Bag
The Rab Alpine 800 Down Sleeping Bag offers a good warmth-to-weight ratio in a sleek design, and for good value. A synthetic insulation is much cheaper but doesn’t compress as effectively as a Duck down filling. It is filled with 800g of 650FP duck down and covered with a wind-resistant Pertex® Quantum outer with a recycled nylon lining. The shape is engineered to maximise down performance using Trapezoid boxwall baddles for full loft. This helps to eliminate cold spots and increase warmth inside the sleeping bag.
The Chevorn baffle design is unique to Rab, where this pattern offers better stability and spreads the down more evenly around the body. The hood has a 3D-shaped collar with a cinch to trap heat around the opening. Plus down-filled baffle along the zip to prevent heat escaping through the YKK zips. The tapered mummy design aims to remove bulk and weight without restricting movement for a comfortable rest.
My Experience with the Rab Alpine 800
My first decision when buying a premium sleeping bag was to decide on the insulation. Whilst synthetic insulation is cheaper and performs thermally when wet, duck down is warmer and compresses better. The ability to compress the sleeping bag small when packed is perfect for backpacking and trekking. I decided to invest in a natural Down Sleeping Bag and then use a Sea to Summit Compression Sack to minimise the packing space in my Osprey Atmos.
Over the multiple backpacking trips, the Rab Alpine 800 has reliably kept me toasty in extremely cold conditions. With a good quality insulated inflatable mat and a sleeping bag liner, the 16°C / 3°F temperature rating can be pushed. I went as low as -25°C at 4000m in Nepal, which was pushing it, wearing base layers and a down jacket at night. It’s difficult to get a better all-round down sleeping bag for under £350. Since the Annapurna Circuit trip, the Rab Alpine 800 has been a solid part of the Trekking Kit List. And been tested in snowy conditions in Patagonia as well as freezing mountains in the Himalayas, passing each test comfortably.
Tip: A sleeping bag liner will add more comfort, several degrees of warmth and keep your bag clean
Where this bag earned its keep
I don’t review gear out of a box. Read the full destination guides where the Rab Alpine 800 provided crucial warmth on freezing high-altitude nights.
Key Specs
- Wind resistant 20D Pertex® Quantum nylon ripstop (36gsm) with fluorocarbon-free DWR
- Lining: 20D Recycled Polyamide Nylon (38gsm), Outer: 100% Ripstop polyamide
- 650FP European Duck Down with Nikwax Fluorocarbon-Free Hydrophobic Finish (800g / 28.2oz)
- 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 stuff sack included
- Hand-filled in Derbyshire, UK, with virgin down feathers, maintaining loft and quality
Rab Alpine 800 Down Sleeping Bag – Strengths
- Great warmth-to-weight ratio: A winter-rated sleeping bag that weighs under 1.3 kg for the Regular. It balances warmth, cost and weight efficiently for mountaineering or trekking adventures.
- Weather Resistance: The Nikiwax Hydrophobic feather down treatment dries faster and retains loft well, even in damp conditions, which is useful when camping or in unpredictable conditions. The Pertex Quantum shell, from experience, is a good protective barrier against moisture and wind.
- Quality build & Sustainability: Rab builds quality products, with this hand-filled sleeping bag not being an exception. The smart baffle design and integrated zips and pockets provide a highly practical and versatile sleeping bag. The Rab Alpine 800 uses certified Responsible Down Standard fill.
- Affordability: With the caveat, it’s affordable for a premium natural down sleeping bag from a reputable outdoor brand. It offers cold performance for around £330–£350, undercutting pricier rivals.
- Versatile for multi-season use: Great for autumn to early spring use and high altitude activities. It’s rated as 4 seasons, but won’t handle the depths of winter. It can work in summer as well, with the zips open for ventilation.
- Comfort: A silky and smooth inner lining adds to the Rab Alpine 800’s comfort for a good night’s sleep. The baffles are quieter and surround the body to provide consistent warmth with minimal cold spots.
- Lightweight and Packability: For a 4-season sleeping bag to be under 1.3kg is impressive for the £330 price tag. Adding the ability to compress the sleeping bag in the stuff sack when backpacking is a bonus.
Rab Alpine 800 Down Sleeping Bag Weaknesses
- Moderate down quality: The 650FP duck down quality is solid, but not as lofty or warm as higher-FP goose options. I wouldn’t use this sleeping bag for anything below -20°C.
- No formal EN/ISO rating: The technical specs use Rab’s in-house Sleep Limit of -16°C / 3°F. In reality, this aligns fairly well with the comfort limit but can be pushed to an extreme limit of around –20 °C from testing.
- Fit may feel snug: The tapered “Alpine” cut edges close to the body and might not suit everyone. I found it had good space to move, but people with a broader build or light sleepers might find it snug.
- Basic stuff sack: The included bag lacks compression straps — consider upgrading to a more compact sack such as the Sea to Summit Compression Sack to efficiently pack your backpack.
Best Use Cases for the Rab Alpine 800
The Rab Alpine 800 is designed for those who need a reliable, 4-season sleeping bag that can transition from the rugged trails of the Canadian Rockies to high-altitude international treks. Here is where this bag truly excels:
- High-Altitude Trekking: With a sleep limit of -16°C (3°F), this bag is perfect for the freezing, uninsulated tea houses found on the Annapurna Circuit or when camping at high-elevation base camps in Peru and Bolivia. It provides the critical thermal safety margin needed for cold mountain nights.
- Winter Camping & Road Trips: It is an exceptional choice for shoulder-season or winter road trips through the Yukon and Northern BC. When you are sleeping in a tent or a vehicle in sub-zero temperatures, the tapered mummy shape and 650FP insulation provide a cosy, reliable cocoon without the astronomical price tag of an expedition bag.
- Mountaineering & Multi-Day Wilderness Routes: For climbers and trekkers who need a durable, water-resistant bag that can handle being stuffed into a pack day after day, the Pertex® Quantum outer shell offers great protection against the damp conditions often found in alpine environments. It is the “value king” for adventurers who prioritise ruggedness and warmth over ultralight minimalism.
Alternatives to Consider
While the Rab Alpine 800 is a fantastic mid-range workhorse, your choice might shift if you are prioritising ultralight packability for multi-day wilderness routes or if you are preparing for a truly extreme high-altitude expedition. Here is how it compares to the more technical options in the Rab lineup:
1. Rab Neutrino 800
- The Verdict: The premium upgrade for the gram-counting backpacker.
- The Details: If you find the weight of the Alpine 800 a bit restrictive for long-distance trekking, the Neutrino is the logical step up. By utilising a much higher 800FP European Goose Down (as opposed to the Alpine’s 650FP Duck Down), it achieves a significantly better warmth-to-weight ratio. It is rated to a lower sleep limit of roughly -22°C (-8°F) while remaining more compressible in your pack. It is the ideal choice if you value high thermal performance and want to keep your base weight as low as possible for challenging alpine ascents.
2. Rab Andes Infinium 800
- The Verdict: The expedition-grade “bunker” for extreme conditions.
- The Details: For those planning high-altitude expeditions—such as mountaineering trips to the Andes or the Himalayas—the Andes Infinium is in a completely different league. It features top-tier 800FP Goose Down wrapped in a GORE-TEX Infinium™ Windstopper® shell, which provides an impenetrable barrier against fierce winds and tent condensation. It also utilises TILT (Thermo Ionic Lining Technology) to reflect body heat back to the sleeper. While it is significantly more expensive and carries a higher “expedition weight,” it is built to keep you alive and comfortable in the most brutal environments on the planet.
Rab Alpine 800 Down Sleeping Bag- Kit Rating
Bottom Line
The Rab Alpine 800 firmly stands its ground as a premium-value, winter-capable sleeping bag. It delivers incredibly solid insulation utilising 650-fill power duck down, features a smart, heat-trapping baffle design, and offers great packable convenience—all at a highly competitive price point. While it naturally won’t outperform the massive, 800+ loft expedition winter bags that cost twice as much, it is a highly reliable, relatively lightweight all-rounder for cold-weather hiking, mountaineering, and multi-season adventures.
The Rab Alpine 800 has travelled with me on various demanding treks, consistently keeping my core warm during freezing nights high up in the mountains. If you need reliable 4-season performance without the extreme price tag, this bag is a superb investment.
FAQs
What is the temperature rating of the Rab Alpine 800?
The Rab Alpine 800 is a true 4-season winter bag. Rab states an official “Sleep Limit” of -16°C (3°F). It performs exceptionally well in sub-zero alpine conditions, though pushing it to extreme cold below -20°C would require an expedition-grade bag or supplemental insulation like a high-R-value sleeping pad and a down jacket.
Is the Rab Alpine 800 waterproof?
No sleeping bag is completely waterproof, but the Alpine 800 is highly weather-resistant. The 20D Pertex® Quantum outer features a fluorocarbon-free DWR (Durable Water Repellent) finish, and the down insulation is treated with a Nikwax hydrophobic coating. This means it handles tent condensation and damp environments beautifully without losing its critical heat-trapping loft.
What type of down does the Rab Alpine 800 use?
It uses 800g of 650-fill power European Duck Down. While it isn’t the highest fill-power goose down on the market (which smartly helps keep the retail price affordable), the down is R.D.S. (Responsible Down Standard) certified and provides an excellent warmth-to-weight ratio for winter backpacking.
How small does the Rab Alpine 800 pack down?
For a robust winter bag, it packs down to approximately 36 x 19 cm (14.2″ x 7.5″). While it is bulkier than ultralight summer bags, it is highly compressible for a true 4-season down bag. Using an aftermarket compression sack rather than the included stuff sack can help reduce its footprint in your trekking pack even further.
Hi, what size is that drybag?
The Sea to Summit Compression Stuff Sack is a Large size