I just got a Buck 703 "down" sleeping bag from a buddy for fixing up his good bag. It's the same one sold on ebay but he picked it up when we were stationed in Korea for even cheaper. I cut her open just a bit to see what the fill actually was. Feathers..... a LITTLE bit of down and mostly feathers. The bag is heavy, poorly designed, and doesn't compress much.
He said that it kept him warm but he is a warm sleeper... I'm not.
Is it even worth trying to use as a TQ or UQ?
How well do feathers actually insulate?
Like I said, it's poorly designed with multiple layers of fabric and unsealed baffles. So it would be quite a task to make it decent.
Is it worth the effort?
What would you do with it?