I posted the other day about the issues of using a sleeping bag as an under quit... The biggest issue seems to be the air gaps.
I was thinking that one could use some shock cord to keep the UQ/sleeping bag up and against the hammock the entire night.
I'm EXPERIMENTING with winter camping and I would prefer not to lay down $1k for the correct gear if it turns out I don't like it.
Right now my total expenditure is only $600 so not bad.
I have a couple winter sleeping bags I'm trying to use for UQ/TQs...