I have some old MIL-SPEC sleeping bags laying around: 1 green patrol bag and 2 heavy weight black bags. I'm working on getting gear together for a section hike on the AT and was considering repurposing my bags as under quilts and top quilts, but was wondering which one is more important initially for a summer hang in Virginia? A TQ or UQ?

Part of me says that a UQ b/c of draft, etc over my elevated backside
but I'm a noob and I'm always looking for suggestions...