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Update: It worked quite well, and shrinkage was significant. A fairly full balloon went down to empty. That being said I think some kind of "balloon clamp" would be good to add for peace of mind. I think all the seals were good but it's possible there could have been a slow leak. Also it was...

I ferment in a plastic bucket primary only so the air space is considerable. I think you're right that the water density change is minimal, but if you have few litres of air then there will be... Shrinkage

I'm not too concerned with the liquid, rather the o2 introduction. Anyway I'll post results. Crashing it later next week.

I was looking for a way to avoid suck-back and oxidation when cold-crashing. I heard some people use a balloon, so I built this thingy. Balloon will be filled with co2 of course. I'm kinda proud of this device so I thought I'd share.