Tub Size VS Snake Size, When To Upgrade

My ball pythons all range in weight from 475 gr. to 775 gr. They're all housed in 25 quart sterelite tubs. Just a tad less floor space than 28 quart tubs. My question is at what size/weight is it reccomended that I upgrade them to a larger tub. And should I go to a 32 quart or straight to a 41 quart. My snakes in the 500 gr. range seem to be fine in the 25 qt tubs, but the ones that are up in the 750 gr range are getting a little cramped.

You could try them out in larger tubs. Most balls prefer the security of tight quarters. At thier size 41qt might be a little much, so I would go for the 32qt. If they act like they are stressed out, put them back in the smaller tubs or offer more hides.

I do neos to 500 g in 15 qt then 500 -1000 in 28 qt and anything bigger for bps only i go to 41 qt tubs all without problems