I'm curious about the idea, kinda feel like it would be easy to get cold spots. I think it's easier to realise you've tossed and turned enough to get a gap with a quilt, but with a false bottom, it's fabric all over so might not be as obvious. Then again it's performance innit
Na I reckon it'd be totally fine. All the insulation is coming from your pad anyway. That's the whole point of a quilt. So a false bottom bag is just eliminating the drafts of a quilt, without the additional (pointless) weight of down.
Speaking of false bottoms, I forgot cumulus now has some:
https://cumulus.equipment/eu_en/down-sleeping-bag-aerial-180.html
I'm curious about the idea, kinda feel like it would be easy to get cold spots. I think it's easier to realise you've tossed and turned enough to get a gap with a quilt, but with a false bottom, it's fabric all over so might not be as obvious. Then again it's performance innit