Kevin_Ristau Posted December 21, 2002 Posted December 21, 2002 I have used a -7C down bag for years, with both a bivvy-bag and a synthetic overbag. The bivvy bag does not really make the system any warmer, and the condensation buildup is a big factor. The overbag works well, you can feel the ice crystals in the overbag. However, the overbag only extends the use of your main bag, it does not make it a winter bag. I splurged this year and bought a -20C Integral Designs down bag Quote
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