Plastic bins that are that small can keep a snake alive, but it will not thrive in that situation. Keepers like that seem to think that if a snake will eat, drink, poop, and breed then its fine when in all reality the animals deserve to practice their natural behaviors. That includes thermoregulating, choosing hides, climbing, etc which tiny racks do not provide. Now, large racks that provide enrichment can be fine, but its the tiny ones that arenβt good.