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Rab Ascent 500 Sleeping Bag

Rab Ascent 500 Sleeping Bag

£204.00 £240.00
15% off

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A quality performance Hydrophobic duck down bag with a relaxed, comfortable fit for regular outdoor use where comfort and warmth are more important than extreme performance and minimal weight. 


Season : 2020W C

Code : QSG-68-LZ

Weight : 0KG

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Rab now use Hydrophobic Down in all their sleeping bags, this flurocarbon free treatment was developed in conjunction with Nikwax and although Hydrophobic Down is not waterproof it dries much faster, absorbs less water and retains loft far better than untreated down. The Ascent 500 is a 3 season season bag designed in a semi-rectangular shape that is user friendly for general camping or for those wanting a bit more room than a tapered mummy shaped bag.  The Ascent 500 offers fantastic value for money, quality construction and low weight for its performance. All Rab sleeping bags with left and right zips can be zipped together to form a cozy double bag.

Filled with 500g of 650 fill power 80/20 Grey Duck Down in a Semi-Rectangular shape which is optimised for the specific fill weight. The generous internal shape is cut to allow a more relaxed sleeping position without sacrificing the performance needed for general mountain and outdoor activities. The shape of the trapezoidal internal baffle chamber delivers a very stable structure that delivers a consistent distribution of down throughout the bag. Differential cut ensures that the space between the lining and the outer fabric is optimised for the specific filling and fill power. These two technologies combine to maximise the potential of the down to loft naturally and reduce migration resulting in greater performance.

The outer and inner fabrics are Pertex Quantum which is durable and lightweight and dries exceptionally quickly. Access is via a 3/4 YKK zip with an anti-snag baffle. An internal shoulder baffle helps to keep all the warmth in the bag and provides the ultimate in snuggly comfort. Both the hood and the shoulder baffle have drawcords.

Temperature ratings are used to indicate a bags performance but are subjective and can be hugely affected by many factors such as your health and metabolism, how much you have had to eat or drink, how active you have been, humidity and altitude, the type of shelter used and whether you are using a suitable insulating mat. Your sleeping bag is only as good as the mat that’s beneath it, we recommend EXPED mats for comfort and insulation.

The "Comfort" rating indicates the range at which a woman gets a full night’s sleep; the "Limit of Comfort" rating indicates the range at which a man gets a full night’s sleep and the "Extreme" rating indicates a range at which a woman is protected from hypothermia.  The Extreme rating is basically a survival rating and it is not advisable to rely on this for general use. The ratings we have published are Rab's "Sleep Limit" ratings which are calculated from EN13537-2002 and BS TOG ratings.

  • Pertex Quantum inner and outer fabric
  • 650FP European Duck Down
  • Rab fluorocarbon free Hydrophobic Down developed in conjunction with Nikwax
  • Wide mummy shape
  • Proportionally assigned differential cut
  • Internal YKK 3 coil zipped stash pocket
  • Wide foot area for extended comfort 
  • Left hand side ¾ length YKK 5 coil main zip
  • Anti snag zipper webbing tape
  • Internal collar and hood drawcord
  • Improved close fitting neck baffle design
  • Trapezoidal baffle chamber design
  • Angled foot box
  • Compression stuff sack
  • Cotton storage sack
  • Temperature tested to new European standard EN13537: 2012 (excluding 900 fill)
  • Hand filled in Derbyshire UK
Pro Opinion

Words by Dom Haseldine

For a person that has laboured with a large synthetic sleeping bag for the last 5, years the Ascent 500 is an absolute treat!

So, first let’s cover the specs; the bag itself has a Pertex Quantum inner and outer with a filling of hydrophobically treated 650 fill-power duck down which is put into trapezoidal shaped baffles to help alleviate cold spots and increase thermal efficiency. It weighs just 1125g, comes with a cotton storage bag, a compression stuff sack and has a generous mummy shape. The comfort rating is 1C, the lower comfort limit is -4.5C and the extreme rating is a massive -22C.


Seizing the chance to review the Ascent 500, I swiftly planned a bivvy out in my back garden (Hay Bluff) at the end of November to allow the bag to flaunt its pros and cons. I checked the weather for Hay Bluff that evening, a cool 2 degrees with 50/50 chance of fog; a fair challenge for most down sleeping bags due to the wetter conditions. Although my synthetic bag has a comfort rating of -5C, it’s very large and took up most of a 50 litre rucksack; this is where the ascent 500 for me really showed its potential. It tucks neatly into the lower section of my rucksack in a dry bag with the compression stuff sack over the top, I wasn't going to take any chances. I ventured onto the Bluff, leaving the house at 6pm. It was dark by this point, the conditions were cold with a slight breeze, but clear.

blak n white

I had an enjoyable walk up to the Offas Dyke path, heading along the cats back towards Longtown to find a suitable space to bivvy down. Looking forward to jumping in the sleeping bag, it didn't take long to find a good spot which was suitably screened of from the wind. Swiftly laying out the bivvy bag, bed and sleeping bag, I packed my rucksack into a drybag before piling in for the night. Once in the bag, it didn't take long to appreciate the subtle differences between my two bags; the down gave an almost duvet feel with a noticeably warmer temperature. The two cinch cords at the top of the bag were also extremely beneficial, helping to trap the heat in and keep the cold out. The generous fit of the bag was a welcome change having tried several alpine bags which taper in and trap you like a straight jacket. The Ascent was exceptionally comfortable and completely in it’s element.

Apart from a lost or malicious horse stomping past very closely, I only woke up once in the early hours due to a moisture build up in my bivvy which had formed from the fog that had developed over night and dripped on my face; met office strike again! The sleeping bag surprisingly managed to put up a very commendable fight against this! The outer of the sleeping bag had patches of beading water with a few sections beginning to soak through slightly. This was most likely down to the ridges in the bed I was sleeping on collecting water and my weight pushing the bag into them. After re-packing the rucksack and having a quick bite to eat in the morning, I set off on my return journey.

Shortly after returning home, I got the bag out and laid it on the table, giving it a quick wipe where necessary. Very little moisture had absorbed past the face fabric and the down had hardly clumped at all, which was unexpected due to all the moisture in the air which had formed on the inside of my bivvy. If the bag had not had hydrophobically treated down I may have been a little more cautious, however the aim of these reviews is to push the Ascent past it’s comfort zone!


Overall the sleeping bag handled very well around its comfort limit with very little cause for concern, giving me a very comfortable nights sleep and coping well with the adverse weather conditions. Although the bag would be perfect for drier conditions given the nature of down, the Ascent handled it’s first damp outing without any issues. The large amount of space in the bag is a very welcome change from narrower, less comfortable bags and the cinch cords make it easy to warm yourself up after a cold slog up the Black Mountains.

Description by Retail Assistant Manager, Dom Haseldine Words by Dom
Reared at the foot of the Black Mountains and is a keen outdoor photographer.
Care & Advice

How to wash your down products

Having spent years talking to people about down products, whether that’s a jacket, sleeping bag or even a pair of slippers, very few have had the confidence to go ahead and wash the product on their own, especially when they have just spent an arm and a leg on it. This small guide is here to explain that it’s not as daunting and utterly terrifying as it first appears.

Step one: Before you even get near that washing machine, wipe off any excess mud or dirt that may be lingering on the surface of the jacket, as this will clog up the washing machine, eventually rendering it useless.

We recommend the use of Nikwax Down Wash Direct for down products as it’s one hundred percent environmentally friendly and will wash and re-proof the garment without the use of bleach or any other nasty chemicals. What household washing agents can (and often do) is remove the water repellent coating on the fabric of the jacket, whilst also damaging the delicate array of feathers inside.

Step two: We’ll assume in this instance that you’ve been washing other products prior to your down jacket and have used a bleach based detergent. Therefore it’s a good idea to run the washing machine for half an hour or so without anything inside to rinse it clean before adding the Nikwax or putting the jacket in. Also, don’t forget to remove the detergent drawer to give it a wash inside, outside and behind, as detergent can clog up and still enter the washing machine if not cleaned out thoroughly. This ensures that any remnants of detergent are removed and that the Nikwax products will work effectively.

Step three: Set the washing machine to a cold wash (check the garments care label, most tend to be around 30°C) and as delicate as possible. Most washing machines have a “wool” cycle which is ideal.

Step four: If using Nikwax Down Wash Direct, place 100ml in either the tray or directly into the washing machine inside a small pot/ball. If you choose to use another washing product, place the appropriate amount in the machine in the same way.

Step five: Set the washing machine to run on a slow cycle, allowing plenty of time for the jacket to soak up the cleaning/re-proofing product. Most washing machines will have a pre-set time for different washing cycles.

When the cycle has finished be prepared for a shock, your precious bit of kit will come out looking like a soggy ball of material. But don’t worry, you haven’t ruined it, it’s just that all that fluffy down insulation has become water logged and has clumped together. The trick is to now get all that down nice and dry to reinstate its superb insulating properties. Simply hanging it up in a warm place will not work that well. It will take days to properly dry and you will have to constantly break up the clumps to get it thoroughly dry. The best way is to use a tumble dryer; either a domestic one for smaller items or a commercial drier for sleeping bags.

Step six: Pop the garment into the dryer and make sure to select a low heat; a high heat runs the risk of melting seams and fabrics within the garment. It sounds weird, but shove a few tennis balls into the drier with the garment; the tennis balls will bounce around and help to break up the clumps of down. Every 20 minutes, pull the jacket out of the dryer and lie the jacket down on a table. Run your hands over the jacket until you find a 'clump' or ball of down; tease apart this down clump and spread it evenly into the baffle. Once you're confident you've pulled apart every clump to the best of your ability, stick it back in for another 20 minutes. Keep repeating this until there are no more clumps left. 

Step seven: When the cycle has finished and you are sure that you have got the garment as dry as possible, hang it up in a warm dry place, an airing cupboard is ideal, for 24 hours. This drives out the last of any dampness and allows the down to loft fully. Take it out and give it a good shake and, hey presto, it’ll be as good as new.


Technical Information

Weight: 1040g

Comfort: 1°C

Limit of comfort: -4.5°C

Extreme: -22°C

Rab limit: -6°C

Sizing Information

Max User Height: 185cm/72.8in (Standard) | 200cm/78.8in (Extra Long)

Shoulder Width: 75cm/29.5in

Hip Width: 65cm/25.5in

Foot Width: 50cm/19.5in

Packed length: 37cm

Packed diameter: 24cm

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Rab Ascent 500 Sleeping Bag

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Excellent customer service. Really detailed easy to understand product descriptions on the Trekitt website, and gear reviews on the Trekitt YouTube channel made it so easy to choose the right backpack for me.
Emily - May 2020
Amazing service! Very helpful in regards sizing and what most matched my needs, despite this being done over the internet. YouTube videos of products being examined are very useful also. Would definitely use again, very fast and efficient delivery. Brilliant! Highly recommended!
David R - April 2020
Highly recommend. I usually go to the shop in Hereford as staff are alwasy very helpful and knowledgeable. So this was the first time I have purchased online and the service was just as good as the shop.
Grizzy - April 2020


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