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Ascent Bivi

Ascent Bivi
Our Price:  £179.99
List Price:  £219.99
Saving Of:  £40.00 (18%)
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Product Code:  WC104
Brand:  RAB


The use of Exchange Lite eVent fabric on the upper has reduced the bulk and weight considerably. There is a 10000mm H/H waterproof base, however a much needed removable mosquito/midge netting has been added around the mouth of the bag, along with a supporting cord to allow the mouth to be kept open with an appropriate support.

So the result is a 560gm bag which is only slightly bulkier than a Rab Survival Zone, but more durable and breathable. However with the addition of the netting, it does mean that (a) it can be used when the bugs are out, and (b) it'll keep the slugs out of your hair!

A good length at 2350mm x 800mm with a gusset of 300mm it is suitable for most people with a sleeping mat and a 3 season bag up to around 6'2".

Ideal for general walking, bushcrafting, mountain climbing and lightweight quick ascents.

Model MR-27-OL

A Backpacking Story - March 2011

So Spring is finally here, the clocks have moved forward, the sap is rising and the sound of lawn movers being used on the first cut, is resounding around the neighbourhood.

A couple of weeks back I ask Ash if he would like to go for a quick bivvy trip on the Black Mountain down in Wales. It was a beautiful crisp, but sunny Saturday when we set off heading up into the hills. We hadn't seen each other for a while and there was no hurry, so we enjoyed the sunshine, the conversation, the occasional food break and the views.

The purpose of the trip was (a) to escape the office and (b) to video a night in the wilds and the gear used, as a reference for customers.

However, at times like this when you think you are familiar with your surroundings, a good conversation can distract you from regular map reading. With the sun shining, the blue sky, the crisp fresh air, fantastic camera set up shots were easy to come by. We were having so much fun that we in fact, didn't follow the path and ended up 3 miles from where we should have been setting up camp. When we finally arrived it was 6pm, already getting very cold and annoyingly dark.

There was no chance to video the wonderful landscape, the excellent gear in detail or even to just chill out. It was just a case of getting the tarp set up as fast as possible and diving into the bivvy bag to keep warm.

Which was a shame, as I wanted to talk about the new Peak Elite Sleeping Pad, the Rab Ascent Bivvy, various bits of cooking gear. Plus of course the Montane Flux jacket, the OMM Cypher Event smock I was wearing and the Innov8 new 25 litre race pack.

So we had some food, a swig of Whisky, a hot chocolate and we were well and truly tucked up by 7.30pm. Oh what a rock and roll lifestyle LOL!

The night wasn't too bad. Cold, and good breeze at times, and whenever my eyes opened, a whole sky full of stars were laid before me to count, but I never got very far before dropping back off to sleep.

It was cold enough to turn the rain into sleet, and thankfully the micro tarps kept the worst off. Reducing the windchill and making things as cosy as they could be as the temperature dropped to sub zero.

Inside my bivvy I was using my down Marmot 0 degree Hydrogen bag, and had all my clothes on including the Flux jacket, but not the waterproof outer layer. I was wearing the Montane Trail Tights, which don't seem to hold any water. Apart from forgetting some dry socks I was very comfortable and the Peak Elite base performed as it should. Although it is worth noting that any deep mat like that or the NeoAir, really does reduce the amount of chest space in a bivvy bag. I would say I was at the limit with my 44 inch chest. Any more and it would have been impossible to roll over.

The inside of the bivvy was nice and dry in the morning, evening though the flap had fallen across my face during the night, and I was breathing into the bag. That's eVent for you.

So everything performed as it should, we ate well and both our lightweight 6.5kg packs proved to be so light they almost weren't there. Interestingly we both agreed that the content of the packs would almost be the same for joining in with the TGO Challenge, a 200 mile walk across Scotland. The only difference would have been a bit more gear or clothes for comfort and space for that all important accessory - food!

Shame we didn't complete the video, but hopefully I'll get to do another soon.



  • Side walls help maximise sleeping bag loft
  • Glow in the dark zip pullers
  • Supplied in waterproof roll-top stuff sack
  • Weight: 600g
  • Highly breathable Exchange Lite eVent fabric
  • 10000mm H/H laminated nylon waterproof bathtub base
  •  U-shaped zip opening with removable misquito net
  • Size: 2250mm x 700mm

Average Rating (4 Reviews):  
Write a Review and share your opinions!

Fantastic very breathable bivvy bag
Wednesday, 10 June 2015  | 

Have just got back from 2 nights on Dartmoor using this bag. The weather was dry, but windy and cold. I am a hot sleeper and usually find condensation on the inside of my bivvy bags, even with the mouth of the bag wide open etc. I slept one night with the head section help up by the tab and guy line with the midge net closed. The second night was under a tarp. There was no condensation at all on the inside of the bag. I have quite wide shoulders but there was loads of room and I didn't feel that the lofting of my down bag was compressed at all. I have felt like the inside of the material on some bivvy bags is sticky. This was not the case with this bag. I highly recommend this bag.

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12 of 13 people found this review helpful.

Awesome bag, fragile net!
Tuesday, 3 March 2015  | 

I bivvy bagged the whole way across the C2C, plus some experiments prior. In particular it kept me dry during a major torrential rain event in Yorkshire. It was so bad the streets flooded and the wife thought I had probably been washed into the river! I was completely dry, although I did have to keep lifting the bag off of me every minute to let the puddles of water drain away.

I have also tried it under a hosepipe, with me in it. Completely dry!

However, using the zips in the dark is a bit tricky. And you need to learn which zip goes in which direction, otherwise you can be pulling and tugging in the dark! And the zips do not entirely close you in, these is a very small gap on each side. Not big enough to be a major worry, and no slugs found their way inside over 11 nights!

The netting is great, but I did find that it has a tendency to become attached to the velcro at the opening of the bag. When pulling it off it does cause some minor damage to the netting, which overtime could lead to it needing replacing. As a result I've become very careful when putting the netting anywhere near the edge of the bag. Would be 5 stars without this issue.

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14 of 15 people found this review helpful.

epic bivy
Sunday, 9 February 2014  | 

got my exped mattress in and it kept myself my down bag and my small jackrussell dog dry on a very wet night with no tarp just what you need

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9 of 11 people found this review helpful.

Good simple bivy with insect netting
Saturday, 16 November 2013  | 

Great product. The review is spot on and covers all the important points, in particular the inclusion of netting. This is the only bivy in this price range I could find that came with netting.

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11 of 14 people found this review helpful.

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