Review – Rab Alpine 600 Sleeping Bag

Rab’s new Alpine 600 down bag 

“Give it a good shake, and in a few minutes you’ll look round and think the invisible man has snook into your bed for the night! After that initial shock you’ll learn this sleeping bag is very weather resistant, packs smaller than you’d expect and despite all it’s features is pretty damn light, too.”

It’s been quite a winter we’ve had over the past couple of months or so and consequently ideal for testing out Rab’s Alpine 600 down sleeping bag.

So, how has it performed?

In a nutshell – extremely well. Rab have had somewhat of a renaissance with their sleeping bag range of late. The design and thinking behind it all has been given a big kick up the rear – even so, looking through their whole range can be somewhat confusing.

Rab Sleeping Bag Range

There’s bags suited for adventure racers, alpine activities and expeditions – and depending on which range you go for, some having the same comfort rating as another. So, which selection should you look to if there is a bag of with a comfort rating of -10c in one range and again in another?

Well, it’s worth noting how the design for the products vary between themselves. For example, the Expedition Series – the chambers that hold the down have longitude chest baffles to prevent the feathers from potentially migrating to your sides. Hence, maintaining warmth where you really need it. Essential in real cold climes but perhaps not so when temps maybe only -7c.

Saying that – you cannot help but think why don’t they do that for all the sleeping bags anyway?

To guide you on which product to use, Rab use a colour coding ‘traffic light’ system – red being the warmest, amber slightly less so and on and on.

In this case – we have the red Rab Alpine 600 from the Alpine Series – the warmest in the range at -7c comfort with the ability to help you survive to -14c.

Laid out in the tent lofting nicely

The bag is marketed as being ‘all mountain, lightweight and weather resistant’. So, a bit of an all rounder for UK use then – the implication being it’ll keep you toasty, shed condensation and isn’t too heavy to lug about in your pack.

Once you’ve chucked the sleeping bag out into your tent – what have you got?

Pertex Endurance fabric – very weather resistant stuff

Well, first thing you’ll notice is it feels tough – the outer Pertex Endurance fabric sheds light rain easily (I know, I was daft enough to try it out one night after a couple of cans!). Giving it a good tug, you can tell this is a durable fabric but still light enough to let the fluffy white feathers inside float to their maximum.

But, with the outer being so water resistant – it’s not as breathable as some other Pertex fabrics out there.

When you come round to stuffing the bag back in it’s sack – or in my usual case my own dry bag – you will struggle a little to squeeze all the air out. It’s a bit like deflating and rolling away a self-inflating mattress. A little annoying – but it’s what to expect really with such things – of which you may well be thankful for one day perhaps.

Stuffing it back in can be a bit of pain

The inner material is Pertex Quantum – beautifully soft on the skin and extremely light. It certainly feels luxurious when you clamber in for the night – in fact, it’s a joy. Adding to the feeling of instant comfort and warmth is the differential cut between the outer and inner fabrics – the idea being to maximise the loft of the down and fill in any dead air space that may surround you inside.

The latter is something Rab have been heavily researching – how much down and why? Which baffle design?

The ‘golden ratio’ as they call it.

It certainly feels like their efforts have paid off. Because despite there being a full length zip (practically, though they say it’s 3/4 – well, funny that. It almost reaches your feet and that’s not 3/4 length in my book) the bag is really quite light for a -7c comfort rated down bag. By my measurements little over a kilo ( I recorded an average of 1150g’s) and a couple of hundred grammes more including the stuff sack.

It packs down reasonably small in it’s stuff sack by the way – and more so if you store and compress it loose in a larger dry bag with spare clothing et al as I do (fills the space better in your pack and makes for more room). A bonus here is the stuff sack is actually a dry bag – there’s even a ‘storm flap’ just inside the opening which you can seal shut pulling on some cord – excellent!

The zip runs nice and smooth

Alongside the zip is anti-snagging tape – though in all honesty, the zip glides a dream up and down the bag. It tops out in just the right place above your face, too. So, there’s no messing about fumbling looking for the damn thing when your all cooped up tight inside.

Speaking of which – the draw cord to shut the sleeping bag tight around your face is long and useful. You can create an opening small enough that just your nose is poking out.

And inside again – is another lengthy and easy to locate draw cord for the collar – a big lofting collar, too!

Feels like you’ve got a thick cashmere scarf on! Brilliant!

Again, just in the right position is a small internal pocket – large enough to accommodate your mobile phone and batteries to keep warm in cold climes. However, the zip on this can snag occasionally – but it’s no big deal, really.

Stuff sack or dry bag? It’s both! Brilliant!

The lightweight mesh within the baffles seems to work a treat, too. I’ve not experienced any drastic movement of down inside the sleeping bag – a considerable problem on some sleeping bags after regular, heavy use.

And given the conditions we often face in UK climes (damp air one minute, cold and dry the next) the down has not clumped together in any places.

The latter is something I’ve been mindful of on the odd trip. Namely where I’ve experienced a damp, muggy night up on some tops and have had to pack the sleeping bag in a hurry – that’s lazy wild camping for you!

After 3 or 5 nights use, the down despite these conditions still lofts and dries as good as the first – though it may take a while longer to hit it’s maximum depth. Incidentally, the down is 90/10 European goose down – hand stuffed in Rab’s Derbyshire factory and with a US Fill Power of 800.

Given the outer fabric is not as breathable it could as other variants of Pertex I was a little concerned with temperature variants inside and out the bag – ie, will condensation form within the baffles and down – thus potentially wrecking the insulation. After more than 30 nights of action (some trips 6 days duration) I’ve yet to encounter such a problem.

Lofts good, eh? 

As for warmth in the real world – well, I have to admit I warm up quicker in this down bag than many other winter variations I own. For example, the Alpkit Skyhigh 1000 (-17c comfort rating) is a popular sleeping bag due to being fantastic value for money. But it can take me a good couple of hours to warm up in that compared to a Marmot (-7c) one I own and a North Face (-7c) one, too. And of course, this latest edition the Rab Alpine 600.

I don’t have anything comparable from Cumulus, though. A good benchmark for down sleeping bags in my opinion – but at least with this Rab bag you get some home comforts for that bit extra weight. And in the winter – we all like a few features to make the cold more bearable.

And I reckon the comfort rating is about -10c – noting the above remarks – granted this can change from user to user, but I tend to give off a lot of heat and so feel the cold sooner than most. Then again, in theory I should warm a sleeping bag up quicker than others, too.

There was one night where temps were as low as -19c (well, quite a few nights actually) and I did begin to feel a little chill around my hips and feet. I was wearing just base layer thermals, mind. Even so, anticipating the circumstances I brought along with my a down top bag to use as a liner. The Rab Alpine 600 swallowed it beautifully – no drama. And in next to not time I was toasty and warm again.

That’s what I like about the sleeping bag so far – it performs very well – you don’t need to pack any other gear for warmth and bump the rating. There’s generally no need. Besides, I feel uncomfortable with extra layers of clothing on. I was initially sceptical to how I’d get on with this bit of kit from Rab, but those concerns were soon put to bed with me inside it after just one trip.

Give it a good shake, and in a few minutes you’ll look round and think the invisible man has snook into your bed for the night! After that initial shock you’ll learn this sleeping bag is very weather resistant, packs smaller than you’d expect and despite all it’s features is pretty damn light, too.

Overall, an impressive performing down bag from Rab!


10 Comments Add yours

  1. bsdowling says:

    Nice review, made for interesting reading. I initially saw the alpine 600 on your blog a while ago and after reading up on it I decided to upgrade to one. Got it for £220 from gooutdoors which is a pretty good deal. Used it for a descreet wild camp on top of kinder and other peak locations and was absolutely toasty. The comfort limit being -14 and the bag keeping you alive to -34 I think it should be a reliable choice. Packs small and light for such a warm bag. Intact it's been so good a mate of mine went out and bought one. I am going to need another bag for warmer nights though! All in all don't really have anything bad to say about it.
    Cheers again for the review.


  2. terrybnd says:

    Hi bsdowling -The comfort rating is actually -7c. The limit is -14c of which the average user may begin to feel the cold and the extreme is -34c as in it should help keep you alive per se.

    You got a bargain there didn't you! And yes, for what you get it's a warm and light bag. An impressive performer I have to say. Much better than I imagined for winter use.

    If there's one thing I'm picky about in winter it's sleeping bags.


  3. Kathryn says:

    Really nice review. I enjoyed reading it. I didn't see it mentioned anywhere, what was the fill power on the down in the bag?


  4. terrybnd says:

    Hi Kathryn,

    Thanks for the heads up on that! Ooops! Forgot to put that in 🙂


  5. bsdowling says:

    Hi again,
    As always I look forward to your new posts, so keep up the good work. Saw you mentioned on lfto today, seems your fame is spreading. Even bumped into a walker on kinder who when I mentioned wild camping immediately asked if I knew of your blog.
    Just wanted to mention in the review where you say” the warmest in the range at -7c comfort with the ability to help you survive to -14c.” it is infact -34 that it will help you survive to and -14 as the comfort limit. I used it recently at -12 and it was great.
    Cheers, Ben.


  6. terrybnd says:

    Thanks Ben, you're very kind 🙂

    Can I make something very clear to all readers regarding the temperature ratings of this sleeping bag?

    -7c is the comfort rating. As in the average user would be 'comfortable'. Some may feel cold if the temp dropped etc.

    This is the bags suggested comfort rating.

    -14c is the temp limit of where the average user could likely feel the cold per se. Some may not, for example. Hence, it's not stated as the 'comfort' rating.

    -34c is the extreme temp rating. Meaning the sleeping bag could suffice to keep the average user alive at such temps.

    Such ratings can be confusing to the public, often looking at the extreme temp rating and taking that to mean they'd be comfortable.

    Everyone is affected by the cold differently. General health and fitness is one factor, for example.

    The comfort rating is what most people should look to when purchasing a sleeping bag.

    Granted, I've been fine at temps around -10c in the Alpine 600 but others may not. So, it may prove irresponsible of me to suggest otherwise unless I could be proven to think otherwise.

    On the whole by experience and using many other sleeping bags in all weathers and seasons – I'd say this sleeping bag will keep you warm and toasty in less temps.

    But that is ultimately up to the end user to decide and gauge.

    This answer is aimed anyone who may read this post/review, by the way – and is not all aimed at you, Ben 🙂


  7. Office Bags says:

    I appreciate your post, I have book marked this internet site so ideally I’ll see much more on this subject in the foreseeable future!


  8. Anonymous says:

    Well put mate, that does clarify it a lot and will definitely be helpful to prospective buyers. I wasn't trying to be anal about it, just wanted to give it some perspective.


  9. Anonymous says:

    hey, great review. sealed my decision to get one. it arrived today

    question about the dry bag. you have the inner drawcord and flap, then about 6inches of extra bag with that weird band and clip and the top. whats the idea of that?


  10. terrybnd says:


    In transit, you stuff the down bag in the dry bag, pull the cord and seal it shut. Then the band and clip? You make it taught length ways, roll it over it self until you can't roll it anymore – then clip it. This forms a waterproof seal, you see.

    Hope that helps!


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