On 22-Dec-2003, "Rick" wrote:

As you point out, any bag that is wet and then freezes may function as well
as an igloo,

Poor analogy - actually, igloos and quinzees can be nice and warm (well,
compared to a tent or open air).

Your other points are valid - using a vapour barrier at higher temperatures
than ideal may increase your warmth, but decrease your comfort. I wouldn't
use a VB until the temp is cold enough to warrant worrying about wet
insulation from insensible perspiration.

Mike