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[pct-l] Tyvek bivi-sack



--
I guess if you _drink_ the body fluid from the bivy sack at 3am
instead of mopping it up, then you would save even more water.
eeeeeeeeeew    :-)


> Dude-
>
> You had the process half right. Per the expert on vapor barriers,
> Jack Stephenson, you sleep naked in your VB bag [Jack thinks you
> should hike naked but that's another story] and get up at 3AM to
> wipe yourself down with a towel. Per Jack, just mop up the
> puddles. Whats the problem? Jack argues that sleeping this way
> will reduce you loss of body water at night resulting in less
> dehydration and/or water scrounging.
>
> TOM
>
> PS: I think Jack makes great tents but otherwise has bats in his
> belfry
>
> -----Original Message-----
> From: dude [mailto:dude@fastmail.ca]
> Sent: Thursday, October 17, 2002 5:37 PM
> To: pct-l@mailman.backcountry.net
> Subject: RE: [pct-l] Tyvek bivi-sack
>
>
> --
> I think Tom is right.  I used a vapor barier bag as a bivy bag on
> my last ultralight JMT trail run (total gear and food 6 lbs).  It
> just doesn't work as well because the bag keeps the body's
> mpisture in and your sleeping bag will get soaked.  I could not
> believe it.  I woke up at 3am with puddles in my barrier bag!!
>
> you need a fabric that will breathe for a bivy bag.
>
>
>
>> I would use a vapor barrier INSIDE the bag if I was going to use
>> a barrier outside the bag. Otherwise human sweat will collapse
>> the bag in no time. This is the problem with Gortex as an
>> external fabric for Sleeping Bags. It doesn't let the moisture
>> from the sleeping body OUT.
>>
>> Make a vapor barrier from sil-nylon that encloses the body. This
>> will prevent sensible sweat from entering the bag. Actually, it
>> will reduce sensible sweat because the sil-nylon enclosure's
>> humidity will come into equilibrum with the body's skin.
>>
>> Tom
>> PS: Monte, please check with Greg or me. It will save you lots of
>> time trying out your inane ideas.
>>
>> -----Original Message-----
>> From: Montedodge@aol.com [mailto:Montedodge@aol.com]
>> Sent: Thursday, October 17, 2002 2:42 PM
>> To: pct-l@mailman.backcountry.net
>> Subject: [pct-l] Tyvek bivi-sack
>>
>>
>> --
>> [ Picked text/plain from multipart/alternative ]
>> My new winter project!! I want to see if a tyvek bivi-sack will
>> fly. ( As in
>> work) Has anyone dabbled with making a bivi-sack out of this
>> stuff and how is
>> it as far as moister?? I will be taking my down bag down the
>> yukon next summer and will keep it in a dry bag all day paddling,
>> but a few weeks of solid rain could make it a bit "iffy" when in
>> use at night.  Tyvek should add
>> a few degrees of warm as well as long as I don't get wet from the
>> inside out!!! Thanks, Jethro Tull
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