Poncho w/ liner opinions for Winter

As I understand it, the theory with vapor barriers is that if you have one barrier, it goes INSIDE the insulation. This prevents the inevitable perspiration from condensing inside the insulation layer. The result is supposed to be, at worst, a warm swamp.

If you have a second barrier, it goes outside the insulation layer to protect the insulation from wind and outside moisture.

"Pleasure Packing" and "Pleasure Packing for the 80's" by Robert Woods (My copy was a paperback, but I can't find it. :o) were the big advocacy books IIRC. (He didn't like double-wall tents either.)
 
Thomas Linton said:
As I understand it, the theory with vapor barriers is that if you have one barrier, it goes INSIDE the insulation. This prevents the inevitable perspiration from condensing inside the insulation layer. The result is supposed to be, at worst, a warm swamp.

If you have a second barrier, it goes outside the insulation layer to protect the insulation from wind and outside moisture.

"Pleasure Packing" and "Pleasure Packing for the 80's" by Robert Woods (My copy was a paperback, but I can't find it. :o) were the big advocacy books IIRC. (He didn't like double-wall tents either.)
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That's a pretty interesting idea. Do those of you who use this system sleep with anything else on like polypros or something? Is it a problem later on if they get that damp?

I can see this system + sleeping naked + small absorbent pack towel working out pretty good.
 
k-spar said:
That's a pretty interesting idea. Do those of you who use this system sleep with anything else on like polypros or something? Is it a problem later on if they get that damp?

I can see this system + sleeping naked + small absorbent pack towel working out pretty good.
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it is mandatory to wear a head to toe wicking garment layer or it is uncomfortable.

In very cold it is actually not that humid inside the layers. In warm weather you will die haha.

It is a cold weather cheat for getting more out of your gear with less weight and bulk. Like Thomas said you must have at least one barrier inside your bag next to your wicking layer. This keeps the bags insulation from getting wet allowing it to do its job.

The same sort of principal allows a thin glass walled greenhouse to be warm in dead winter.

As long as I have adequate ground insulation I have slept more or less in comfort well below zero with a summer/early fall weight mummy bag and 2 mylar bivi's. It is surprizing to people when they see it. You dont get any lighter a rig than this no matter what the cost. At least that I have found so far. I have tried a few.

The bonus is you have extra stuff for an injured subject with this setup as well, win win.

Skam
 
What rating sleeping bag are you using with this setup? ~30 degree or is it even higher?
I assume it's down as well? This setup seems like it would keep the bag quite dry, as long as there were no leaks.

I'm going to have to try this out.
 
k-spar said:
What rating sleeping bag are you using with this setup? ~30 degree or is it even higher?
I assume it's down as well? This setup seems like it would keep the bag quite dry, as long as there were no leaks.

I'm going to have to try this out.
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Its about a 20 degree mummy bag synthetic. Packs down to a little bigger than a football. It does keep the bag dry, but you need a change of synthetics.

I wear full poly pro winter hat and balaclava. Get inside and it keeps you relatively comfortable in sub zero temps. Try it.

Skam
 
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