Enclosure size

So i ordered a rack for the first time and I plan on getting a few baby BP's is there guidelines on enclosure size compared to snake size. How long will a baby stay in a shoe box size enclosure etc. Im trying to be more prepared than i was when i was a kid with a BP.

What size rack did you order? Babies can go in larger tubs as long as they are cluttered with a lot of hiding places. Otherwise the general rule is the tub's length + width should be longer than the snake's length, though even that can vary depending on the species. You'd want a heavy-bodied snake in a tub with more floor space, but thinner snakes like corn snakes or Savu pythons could go into one that's a little smaller.

I got an AP375 with 4 shelves from Animal Plastics, I figured it would give me some time till/If i needed to buy a larger size since i would need to rearrange my furniture to fit a larger one.