Jerven Fjellduken Original
Heat reflecting, waterproof, simple and reliable, the Fjellduken Original, or Jerven Bag, is a tarp, poncho, bivvy bag and more all in one. This is what Norwegian hunters and soldiers have been using for the past 30 years, as the makers say "The wheel can not get any rounder!"
This model, the Original Fjellduk, was released in 1983 and has remained unchanged since then. It quickly gained a strong foothold among hunters and outdoorsmen, and soon enough also the Norwegian military adopted it. Fjellduken Original is most basic model in the family, but still much, much more than just a piece of waterproof canvas.
You won't find any hi-fi bullshit in your Jerven bag, the technical bits start and end at the zippers, that's it. All of Jervens products are made and developed by the very same people who use them. The unique design and materials make the Jerven bag an incredibly versatile and high performing piece of equipment. This is not your standard modern trinket, which relies on never ending lists of one after another more trivial properties and features to impress people, this is simple perfection at its best!
The package includes
- The Fjellduk Original itsel, 143 x 286 cm opened, 143 x 143 cm zippered shut as a bag. Weight 650 g.
- A carry pouch, two pairs of belt loops and a pocket for a rescue flag.
- A pair of Armings, waterproof sleeves to cover your arms.
- A rescue flag, 50 x 50 cm in size. Never go out in the wilderness without this little life insurance in your pocket!
Online user manuals
The good people at Jerven As have been so kind as to provide their user manuals viewable online:
Tarp and shelter
The 143 x 286 cm Fjellduken can be turned into many different sorts of shelters or windshields. There are leather reinforced grommets in each corner and midway along the long sides. The aluminium coating reflects heat, the principle is the same that emergency blankets rely on. This means that heat from a fire, stove or your very body won't go to waste. We won't go into detail regarding every different tarp and shelter setup there is, otherwise you'd run out of coffee before this write-up is over with.
Click for a bigger image! This tarp is anchored to the ground from its corners and the long side has been tied to a tree. By moving the attachment point to the tree higher up you can move the sides of the opening closer together for even better protection.
Cloak or poncho
Using the zippers you can turn your Fjellduken into a simple poncho or cloak. There are zippered openings for arms and the sleeves that come with the Fjellduken can be used to keep your exposed arms warm and dry.
This is the perfect setup for a hunter or wildlife photographer, sitting in wait under a Fjellduken keeps your trigger finger from freezing and when the time comes you can raise your weapon, be it rifle or camera, in the blink of an eye. As a cloak or poncho the Fjellduken is large enough to cover a medium sized rucksack on the move.
The Fjellduken is a treasured piece of kit in a soldiers pack - it is very popular among snipers, for apparent reasons. "From my own experience I can say that laying motionless on the wet moss inside a camouflaged observation post for hours on end through a freezing autumn night, staring at some bloody road through your NVG can really eat at you. That is one of those moments that I wish I'd had something like the Fjellduken."
Windsack or bivvy bag
This model of the Fjellduken is not a standalone sleeping bag, but can be used as one in emergency situations. When folded and zipped up the size is 143 x 143 cm, not enough to stretch out in, but large enough to curl up. Using a sleeping bag inside the Fjellduken gives you effective protection against the elements, if the weather is horrible just curl up inside but remember to leave an opening to give you some "air conditioning". If it's not raining cats and dogs you can stick your head and feet out of the bag and simply use it as a groundsheet and blanket combination, a moist and cold ground won't bother you through the alumium coated JervenTextile.
Zipping the Fjellduken up all the way gives you a windsack for sitting in wait for longer periods of time. When you're ready to move on you just zip up the bottom to free your feet, whip out your arms through their openings and get up.
- Shell: JervenTextile - 100% water and windproof, aluminium coated polyester. Really tough, a 5 cm wide strip can carry a 50 kg weight!
- Zippers: YKK - a high quality maker you can trust. All zippers are double sided.
Nothing lasts forever, but the Fjellduken will serve you for decades if you look after it properly. If you absolutely need to wash yours, do it by hand and air dry only. After washes or prolonged use it is recommended to treat the Fjellduken with a water repellant spray to keep it waterproof. If you stab a hole in yours there are patches available, contact us if the need arises!
However wonderful the Jervenbag is it still obeys the laws of physics. The content of this section is probably self explanatory to most people interested in the Fjellduken, but let's make it clear.
Waterproof:JervenTexile is a 100% waterproof material, but the construction is not. Zippers and grommets can let in water, wind and snow, just like any sleeping bag. These matters are easy to overcome - fold the zips downwards and pinch in the corners, or just cover the grommets with tape!
Condensation: The 100% waterproof JervenTextile doesn't let in water and neither does it let it out, this means condensation. "Oh no," you say, "no Gore-Tex?" Run and hide if you can't live with some moisture, the level of condensation within the bag is nothing to worry about.
Condensation can become a nuisance if you're sleeping in the Fjellduken alone, but in an emergency situation like this the condensation is probably the least of your concerns. Most of the time you use your Fjellduken for sleeping in it will be in connection with a sleeping bag or blanket. In this case the moisture will find its way through whatever you are sleeping in and stop at the shell that is the Fjellduken, effectively keeping yourself dry and comfortable. Just shake of the moisture in the morning and on you go!
The good people of Jerven have through decades of experience and testing come to the conclusion that a 100% waterproof material with some condensation is far superior to a breathable membrane, that will eventually let in water. Jerven products last for decades due to the strength of the materials used and high quality of construction, trust the Jerven staff when they say that this really can't get any better - they really know what they're talking about!
Some scientific facts
"The most extreme test was carried out in Finland in co-operation with Dr. Hannu Rintamäki at Oulu Regional Institute of Occupational Health. In the wind tunnels in Oulu the temperature was lowered to -40°C, and with the wind factor this corresponds to minus 80 degrees. During such conditions naked skin would freeze in 15 seconds. The test-persons therefore had to be inside the Jerven Bag before the fans were switched on."
Testin tulokset: "Inside the Jerven Bag Original: -20°C, a difference of 60°C outside/inside. Inside the Jerven Bag Thermo Extreme: +8°C!!, a difference of 88°C outside/inside."
10 year warranty
This is really something, Jerven offers their products a 10 year warranty, such trust in ones work is not found often, if at all, these days, even moreso when talking about kit for field use! The warranty covers manufacturing flaws in the textile and seams, not fires, stabbings or you losing your camouflage Fjellduken in the woods. The Fjellduken usually has a lifespan of 10-15 years, so we are really talking about something here that is worth the money!
Made by Jerven of Norway
Jerven bag, those are almost words of power among hunters, outdoorsmen and soldiers the world over. Jerven has been making the Fjellduken since 1982, besides the obvious hunting trips and hikes the Fjellduken has seen action in Afghanistan in the hands of Norwegian and Danish special forces and even the Finnish defence forces have recently adopted Jerven bags for arctic use.
The first thing I did was add Paracord loops to the grommets, to ease the use of pegs and to save the grommets from unnecessary wear. These are easy to adjust for length and quick to detach, no knots need to be opened to do so.
Along with the Fjellduken I carry a handful of aluminium pegs and a wooden walking stick with approx. six meters of Paracord wrapped around it as a handle. My favourite one-man-shelter is pitched by securing the four corners of the Fjellduken to the ground with pegs, then raising one of the long edges using the walking stick as a pole. By unwinding the Paracord from the stick it can be tied tight to a tree or peg to keep the shelter up. This is really fast to put up and gives good protection against the wind and rain, the floor area is roughly 250 x 100 cm.
I found a clever additional use for the armings in winter time. By wearing them on my feet inside the sleeping bag, coupled with thin merino wool socks, I could eliminate all wake-ups due to frozen toes. With these on I can sleep unbothered through the night!
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Jerven Fjellduken Exclusive
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Linus S. 03.10.2017