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[pct-l] Beeping Slags
- Subject: [pct-l] Beeping Slags
- From: "David B. Stockton" <email@example.com>
- Date: Tue, 24 Aug 1999 17:55:23 -0400
I am considering trying an ultra-light down sleeping bag instead of my
North Face Climber 3D, but am concerned with moisture, since I use a tarp
when backpacking. Does anyone know of a source that uses some kind of
"dry-loft" coating on a down bag, or is this a bad idea because of moisture
buildup in the down?
Personally, I can't see any reason to have any coating or GoreTex or
whatever on a sleeping bag, except to prevent your hot cocoa from soaking
it if you spill (not a valid reason for this discussion). One's PRIMARY
goal is get moisture out of it at all times. If one is concerned about
snow cave drips, use a bivvy sack.
All the various coatings, etc, do is slow down the vapor transport out of
the bag, especially that of one's insensible perspiration, which is
considerable. Using a GoreTex bag even in dry conditions without special
drying efforts (read: "No walking") during the day soon results in a cold
bag. (I used a GoreTex down bag for 350 mi of PCT in '94)
A tarp, in my opinion, just helps, because it promotes airflow, which will
help pull the moisture out of the bag. Even under conditions when the
flowing air is very moist, such as in a heavy downpour in a
properly-pitched tarp, one's body heat will help drive out the moisture.
By pitching a tarp before pulling my homemade Hollofill II bag with its
plain ripstop shell out of its waterproof sack, I can prevent solid water
from hitting the bag, and it will stay warmer night after night.
David B. Stockton
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