I want to try my hand at making a multistage sourdough 100% rye bread that will have 45-55% of the flour prefermented. So it could be quite a bit of sourdough in the final full sour stage. I think I can make it work with my Brød & Taylor Sourdough Home but I need to figure out what's the biggest container I can stuff in that thing. I have come across a picture that showed a 2 liter jar inside this proofer.

I found it on Amazon as "Sourdough Starter Kit with 68oz Jar". It's graduated, too. Alas! It was not meant to be. I found out that apparently Brød & Taylor changed the design of the Sourdough Home somewhere along the line making it smaller (at least inside) so this jar doesn't fit anymore. I measured my proofer inside and confirmed that it would be too tight. Too bad, as I was just about to pull the trigger on this one. There is a smaller, 50oz/1.5 L version of it that might just be able to squeak in but at this point I'm just unsure. But I'm certain that, for my needs, the 2 liter one would be more than enough and the 1.5 liter one could just work and I wonder if there are any other containers that could be used here. I couldn't find anything really definitive. Does any one have any experience or suggestions on this one?