"In a sealed bag I hope, or the water will simply transfer to inside your sleeping bag."
When I go snow camping, normally I have my winter-weight sleeping bag. It is carried in a substantial stuff sack. When I reach camp, set up the shelter, and pull the sleeping bag out of the sack, the empty sack is now available for boot storage. I turn the sack inside-out. That way, the normal outside, which might be wet, is on the inside, so it doesn't hurt if I put semi-wet boots inside it. Then that is in the foot of my sleeping bag while I sleep. It works for me.