We have our hatchlings in tubs that are about 3 inches tall, and probably about the same footprint as a piece of printer paper (8.5X11?), and are completely opaque blue. Shorter than the 6qt, but a larger footprint, and allows for a little more growth, but still has plenty of security and sort of works as a tide hide.They get moved out of this tub once they get large enough that they barely fit, and then get moved into the reptile basics rack (about 28-32qt), which is enclosed on all sides except the front, and not quite as large as the breeder racks/tubs. To give you an idea, our largest snake currently in the 'hatchling' rack is probably about 500g, and she's never refused a meal in the last few months we have had her, even in shed. The idea is that I want them to transition to a new home without feeling dwarfed by it. I want them to transition and keep eating without a hitch, and this process seems to work perfectly for them.
We have a couple opaque tubs that are midway between the hatchling and reptile basics rack if we need as well, but they are very rarely ever used.