Poncho & Large Trash Bags
I use my poncho as an overcover & I have a undercover from 2QZQ. However, I use to tie my poncho under my hammock. I always carried 2 large Heavy Duty Trash bags. One was for my inner liner on my backpack, and the other I used for my sleeping bag & UQ.
I would fill them with leaves and put them on top of the Poncho. I had a JRB Mt Washington which was good to @ 25°. So when it would drop down to single digits, it was a good back up. Both the poncho and bags were doing double duty.