[pct-l] Tyvek bivi-sack

[reynolds@iLAN.com (Reynolds, WT)]

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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