I use these for all my pythons. latching-clear-storage-56-qt
HOMZ 56 quart tubs, 30"x24" 6.25" tall. Really cheap at K-mart! Walmart, Home Depot and other places has them for way more $ for some reason. Has latches, but they are not strong, so you will need more security. I just use them in a rack system, so I throw the lids away and slide them out like a drawer, in my rack shelves.

Rack with 4 of the large tubs:

ADULT in the tub:

SUBADULT in the same size tub:

HATCHLING in the same 56 quart tub.