The Jerven Bag

[ged]

I think it is the lack of breathability and nights as a scout spent in an orange bivi bag, waking up soaked in sweat are playing on my mind.

I hear you. I'd have the same problem in one of those things. But the Jerven bag with a liner is completely different. Believe me, if condensation was going to be a problem then I'm one of the best testers you'll find anywhere. I sweat like nobody's business and I've been well impressed with how the Jerven bag handles it. I've never felt the slightest problem from condensation, haven't even noticed any. Big proviso here is that like others have said I've followed Jerven's advice and always given it a good airing in the morning. I just hang it over a line running east-west with the waterproof side inwards. Even if it's cloudy the sun's warmth goes through the insulation and bounces off the reflective layer, so the warmest part is the interface between the insulation and the liner. Which is where the moisture has collected in the night, so it drives it all out. On that side. Then you have to swap it round so the other side is facing the sun of course.

 

[MartinK9]

Size Variations:

https://jerven-com.secure.flexiweb.no/accounts/434197/File/11125.pdf

 

[Andy BB]

I've looked at these before, and to be honest its only the price thats putting me off - over £400 for the Exclusive plus liner! Of the current lot, I'm most tempted by the Thermo kingsize, but even that runs to around £250 (about a tenner more than the Thermo Hunter)....

Also noticed on their website on the price-list page that they no longer seem to sell the Multimate plus tent kit, which seemed a really nice bit of kit.

 

[Corso]

they look good but i do wonder if i should just go for a woobie and save the funds

https://kifaru.net/woobie.html

 

[Shewie]

they look good but i do wonder if i should just go for a woobie and save the funds

https://kifaru.net/woobie.html

It's not often you hear kifaru and save in the same sentence

 

[Shambling Shaman]

Could you use this in a hammock as a stand alone and ditch the sleeping bag, thermorest combo?

 

[Ahjno]

Could you use this in a hammock as a stand alone and ditch the sleeping bag, thermorest combo?

I've got no experience with that, though I did thought about it and reckoned it might be possible to use the shell as some sort of UQ (trap warm air) and the liner as a sleeping bag. That said, I don't do UQ's when hammocking ...
Or alternatively: figure out a system in which the hammock is enclosed by the Jerven (though a possible nightmare to get in / out).

 

[ged]

Could you use this in a hammock as a stand alone and ditch the sleeping bag, thermorest combo?

They might be a bit unwieldy in a hammock, they're a lot wider than a sleeping bag. My feeling is that they wouldn't suit hammocking very well at all because of the size and shape.

 

[Shambling Shaman]

They might be a bit unwieldy in a hammock, they're a lot wider than a sleeping bag. My feeling is that they wouldn't suit hammocking very well at all because of the size and shape.

Thanks, will sick to my tried a tested set up

 

[Andy BB]

Sorry to reactiveate an old thread, but my daughter and fiance are going to Norway in January on a business trip, so thought it might be the time to get them to get me a bag!

A number of questions for those who have, or have had, them:

1. The new bag with the detachable lining (the Exclusive); the major advantage seems to be the detachable lining, and the choice of either the 70gsm or the 170/200gsm linings. The benefits being both interchangeability if you can afford both, and the fact that it makes airing them out easier because you can completely detach the lining. However, you can get other Jerven bags with either lining weight (eg Hunter or Thermo extreme), and it appears that these can be aired pretty effectively without separating liner and bag - lucky as you can't separate the lining! So is the detachable lining really beneficial enough to cost another 150 quid?

2. The best size? In my case either the 102x220(in sleeping-bag configuration) for the Thermo extreme, or the lighter-lined but much wider Thermo Kingsize (143x220)? Considering that the THermo extreme is just on 80 inches in diameter, how much more space do you really need, even for us big blokes?!

 

[ged]

1. ... is the detachable lining really beneficial enough to cost another 150 quid?

In my experience (Thermo Extreme, a little over a year) I'd say not, but then I'm always careful to keep the lining clean and I never go for more than a couple of days without airing it well. I've never had it smell like an old goat or whatever it is the makers claim in their Website that it will smell like if you don't air it. Having said that I would consider a detachable lining an advantage, just not that big of an advantage. I think I'd probably just buy another one with a thinner lining. Then I could use it more of the year. Mine is too hot for mild weather really, I used it for the first time since spring at an October meet in Derbyshire, and I got a bit sweaty.

2. The best size?

Depends on your size(s) and intended use of it I'd say. The wife and I have been out meteor-watching in -15 and a howling gale in the Peak District and there's enough room in the Thermo Extreme for us both, even though I have to keep getting out to make her more coffee. We average out around six foot/70kg each if I can mix units like that.

I've used mine as a reflector/windbreak behind me with a fire in front and that's the only time I'd want it any bigger, so that it could wrap around that little bit more but stay far enough from the fire not to catch light. TBH a cheap tarp in addition would be at least as good, and probably as good if it's made of space-blanket type material with a reflective coating. I have something like that which I picked from eBay recently but I haven't had a chance to compare it yet.

 

[bikething]

The best size? In my case either the 102x220(in sleeping-bag configuration) for the Thermo extreme, or the lighter-lined but much wider Thermo Kingsize (143x220)? Considering that the THermo extreme is just on 80 inches in diameter, how much more space do you really need, even for us big blokes?!

I used a Thermo Hunter (which is the same size as the extreme) with a Nanok -10 bag in it in Canada a couple of years ago - there was still plenty of room left in the Jerven for wriggling about in

 

[Twodogs]

Mines a thermo XL and I love it used it with a US poncho liner as a bit of extra in the summer dont think it needed it really and a nanock 0 in the winter .
I have always aired it a bit after use without any problems .
the thing I like is you just throw it on the ground and jump on or in .

Twodogs

 

[hogstable]

I think the best part about it from the little I've read to be fair is that you can use it in several ways, so for example sitting up in it in a hunting position / reading a book. I've heard but can't confirm that some parts of the forces who can get the government to buy them specialist equipment got it bought for them. So being warm whilst sitting up in different positions seems a good idea. Never used it so my comments are just pinch of salt stuff.

You may be interested in looking at the ecotat shelters which are on a similar- ish vein, don't know if they have the same amount of insulation. Echoing the travel light freeze at night, I used a much cheaper version using a poncho with a thermoflect blanket. Put a slit in the thermoflect blanket for the head to go into the poncho hood, do the same with a poncho liner too and it seems a far cheaper and less effective variation.

PS Happy New Year Two Dogs

 

[hogstable]

More info on the Ecotat, no links to them at all etc.

http://www.combatreform.org/ECOTATSYSTEMS/ecotattmp.htm

Think someone may have reviewed this before, their summary was that the weight of all the things this would replace, eg tarp, waterproofs were the same weight as the Ecotat so what was the point.

 

[Twodogs]

Interesting bit of kit but I will stick with my Jervens

http://www.youtube.com/watch?v=nfghL52Pvqk



Twodogs

 

[bushytoo]

As soon as I get back to England and get a job, I am definitely buying this bag, I want this bag in the worse possible way.

 

[Chiseller]

More info on the Ecotat, no links to them at all etc.

http://www.combatreform.org/ECOTATSYSTEMS/ecotattmp.htm

Think someone may have reviewed this before, their summary was that the weight of all the things this would replace, eg tarp, waterproofs were the same weight as the Ecotat so what was the point.

I had and lived out of an ecotat years ago. (divorce period) fierce piece of kit, that does all. Mine weighed over 3kg ,but considering its multi use, wish I'd never sold it. I still have the goretex stuff sac though and its as tough as they come.

Sent from my HTC One X using Tapatalk 2

 

[bushytoo]

I had and lived out of an ecotat years ago. (divorce period) fierce piece of kit, that does all. Mine weighed over 3kg ,but considering its multi use, wish I'd never sold it. I still have the goretex stuff sac though and its as tough as they come.

Sent from my HTC One X using Tapatalk 2

Thanks for drawing attention to that, tsk that's another bit of kit on my radar now. I'm always on the lookout for versatile pieces of kit and that certainly fits the bill.

Some one on ebay is selling them for only 38 dollars, surely too good to be true?
http://www.ebay.com/itm/Ecotat-Univ...aultDomain_0&hash=item483ff1d57c#ht_658wt_932

Edit
Just seen that he's selling the civilian version. Made in China ( not that's a bad thing)so price is much lower. I wonder how it compares to the army issue.