I was in recent conversation with another hammock camper and he suggested
bivy sack with a regular sleeping bag instead of an underquilt. To me this does t make sense but I was wanting to get y'all's opinions. His reasoning was that the bivy is made of gorges therefor will block wind and other elements.
I don't know just seems like it wouldn't work. I'd be interested to hear if any fellow hammock campers have tried this method and what your results were.