I recently rid myself of a Marmot Medicine Bow 20 degree bag to finance a 3S Burrow. I couldn't handle the constrictive mummy shape. I'd definitely recommend using the Marmot bag as a topquilt – because for $75 you can't beat it. I'd trim off the zipper and the hood, but thats just me (I wouldn't like to carry the extra weight).
Sounds like you scored an awesome deal – if the topquilt idea doesn't work, at the very least sell the bag for a profit!
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