The lack of height is gonna be an issue for a BP so for a 2000 grams animal you will want something close to 6 inches.

I would say up to 1250 maybe even 1500 grams but that would be tight.

When you are gonna feed and they gonna coil you will not be able to close those tubs and that is gonna turn into a hassle very quick, not to mention the snake may coil and not eat because the tub will have to remain open.

Those would be better suited for colubrids IMO