Dakota, if you're worried about condensation from your breathing the easy fix is to take a small piece of fleece cloth and pin it near your face like a bib. That'll collect most of the condensation/frost and will be easy to dry.
The MF series bag I have has a good DWR on it. Water beads up on the outside. The only issue I've had was in a two day rain when the water found a weakness in my seam sealing and developed a drip in the ceiling of my tent. I simply laid my rain jacket over the foot of the bag and had no problems.
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