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   Rab Quantum Top Bag

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Extremely light weight this new range of bags from Rab utilises the new Pertex Quantum fabric (hence the name) for construction of the inner and outer which weighs a tiny 30g/m2. All bags are filled with 96% Polish Goose Down with an enormous 750+ fill power producing a bag with an excellent loft for it's weight. Other features include: Pertex Quantum Outer and Inner 96% Polish Goose Down Fill. Narrow box wall construction ensures the down is placed into the most efficient areas. Minimalist lightweight construction features no zip. Top Bag benefits from 200g of down on the top side. Top Bag has no insulation on the underside and should be used with a Sleeping mat/ Therm-A-Rest. Each bag comes with a quantum stuff sac and a cotton storage sac
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Rab Quantum Top Bag

Official Rab Quantum Top Bag specification from Rab

   Rab Quantum Top Bag Reviews

  Reviewed by Pete Baars (Merseyside) on 2006-04-03:
General comments: Well constructed like all of the Rab equipment that I've used in the past, this bag borrows from an innovative design that as far as I know originally came from Macpac. The principle is that compressed down has little or no insulation value, so then why carry down in the bottom of your sleeping bag which is excess weight and bulk with little or no benefit to you for carrying it around? The whole bag only weighs in at 430g, it's pack size is tiny and according to Rab, it's comfortable down to Zero degrees Celcius. I used it on my sea kayaking trip to Norway for a fortnight last summer, primarily for it's pack size rather than weight. I found it to be more than warm enough for the climate which was mostly cold, wet & windy. The only downside that I found with it is that I'm a 'tosser', I toss and turn in my sleep. As the bag isn't secured to the sleeping mat (like the Macpac Neve which has a pertex sleev that you insert your sleeping mat into), then rolling over caused me to be laying on the down and only insulated by the thin layer of Pertex Quantum on the base. After a couple of nights of this, I tried inserting the mat into the bag, which improved the situation somewhat, but in my opinion, still wasn't as effective as the Macpac solution, due to the tapered shape of the bag.

Pros: Weight, phenomenally low Price, very reasonable for top quality materials and construction Pack Size, tiny

Cons: Cold spots when rolling over.

  Reviewed by Paul (Manchester) on 2006-04-05:
General comments: I brought the Rab Quantum Top bag purely because of its weight and pack size. I wanted to do a three day expedition with a 45ltr rucksack. The weight at just over 400g was excellent, and the pack size is extremely small. In fact it is one of the lightest 3 season sleeping bags there is. The weight is reduced by taking down away whre it isnít used, like on the base, which is replaced with a mesh like material. I have to was the bag was warm, but I found it very uncomfortable. This is due to the thin base, and not such a good hood/neck insulation. I often was awake in the night thinking why didnít I bring a proper bag, however in the morning when I packed it into the rucksack, I thought im glad I brought the top bag. This is therefore my argument, comfort or weight? I actually think that weight is more important, and in my case pack size was crucial. The bag is indeed very durable, as it has been used by myself, and several friends who needed a small bag, and it looks as good as new. It does seem to have a funny smell, but it has had this from new. Anyone know why?

Pros: It is very lightweight, and has a very small packsize

Cons: Not very comfortable, and it smells

  Reviewed by Rich L (Aberdeen) on 2006-04-13:
General comments: The Rab Quantum Top Bag first came to my attention at a mountain marathon event in late 2004. Now used by several of the elite teams it seems to offer a good solution to extreme users. In 2005 my partner for the Lowe Alpine Mountain Marathon (LAMM) and Saunders Lakeland Marathon, used a top bag and reported that it was warm if used with a cut down foam rollmat. He was injured for the Mourne Mountain Marathon and Karrimor International Marathon (KIMM) and offered me the bag to use. I was sceptical, but the weight is phenomenally low so I accepted the offer. Over the two races I did not find it much more comfortable or warmer than the thin synthetic Haglofs LIM 50 (£50) that I normally use. The rab bag is only around 80g lighter than the LIM bag too, but a lot more expensive! In my opinion it would work much better with full size rollmats or thermarests in alpine situations. For the adventure racer who is unlikely to take such items, it is cold on the legs and too much heat escapes through the bottom. Possibly a hybrid solution would work better with less down on top and a very thin synthetic insulation baseÖ.some sleeping bags now have this.

Pros: Low weight, innovative idea, would work really well with fullsize rollmats

Cons: can be cold if using with cut down mats, slippery material


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