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post #6 of (permalink) Old 11-05-2012, 02:21 PM
tu
High on the Mountain Top
 
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Join Date: Apr 2010
Location: Burnaby, BC, Canada.
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It's for when you're wet.

Moisture is bad since it pushes out air (insulating layers work by trapping air) and heat loss from latent heat of vaporization.

The bag will trap air and prevent vaporization, so would insulate and prevent latent heat loss.
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