My most recent Jeep-camping trip a couple of weeks ago:

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30+ year old Northface synthetic fill bag, couple of foam pads underneath and my summer backpacking tent. Slept just fine at 59 years old.

When I'm backpacking, I use an equally old Northface down mummy bag. Have slept just fine with either setup, in some pretty doggone cold temps.

That said, there is something pretty wonderful about just stoking the wood stove first thing in the morning, in a classic wall tent.

Guy