I got a very interesting email yesterday from Stuart Goring regarding a Norwegian invention called the jerven. I've gotten his permission to reprint the email, and he'll probably jump on here to answer questions. Here is what he wrote:
Its best described as the potential illegitimate offspring of your mountain Serape and the issue poncho tarp / liner combination with some Norwegian DNA of its own.
It shares some design similarities with your Serape, (though both are unique designs) but has features which might inspire future generations of your own design.
The most noticeable feature of the jerven bag is the inclusion of a waterproof outer (with double zips on all four edges which mate together in any combination of sides) into which the quilt can be integrated via Velcro around its periphery, the inner and outer can be used standalone with outer as worn as a waterproof poncho or tarp with the quilt as a sleeping bag beneath for the night; or integrated as a waterproof insulated bivi bag (with arms and hood) or ¾ waterproof insulated jacket.
Photos of mine in use in Canada to explain:
(note for the image below and above, unlike a poncho there are no openings here except those in which my face and hands are protruding, the rest is zipped closed, allowing me to move around and change position without pumping out the warm air inside)
The tarp is silver on the inside with a unique (and deceptively versatile) camouflage on the outside, unlike many products today its tough, simple and ultra reliable, its build for the Norwegian mountains after all.
Some Americans may have already encountered it in Afghanistan where some specialised units of ours are using it, (shown here are a number zipped together to make a larger shelter):
The outer also has channels for tent poles to convert it into a tunnel tent if needed:
Here we are using it in reverse (silver side out) with poles to provide shelter from the sun in Botswana:
Even without poles it can be zipped into a little insulated winter pyramid tent (the front flap is open in the photo, but zips up to form the front wall):
The version I have shown in the images above is the ‘MultiMate model’ (best Norwegian translation) which is no longer available to the public.
Many years ago I wrote a review (back when I wrote for BushcraftUK) for the jerven bag when it was publicly available, which might provide further insights: https://jerven-com.secure.flexiweb.no/page/7366/
Another picture in use in Borneo
I hope this provides some inspiration, very impressed with your designs so far, it’s nice to see a company building some really practical gear for wilderness travel, keep up the good work.
All the best