UKC

Hi,
I have an ME Iceline of some vintage with a Drilite outer. I get a lot of condensation under the shell that wets the down and over a few nights the bag gets really heavy and flat in the winter.

Would vapor barrier be the answer? It sounds minging and I would have to strip down to my scruds in a bivvy and then put dry undies on in the morning? Is that right?

sugestions?