I have a couple different size tubs, but I had to add..

I have a mojave female that has a "binkie". I often give hatchlings a hide(plastic cereal bowl with a "door" cutout). As she's grown up, I took out the hide as she didn't fit into it anymore and she promptly stopped eating. So I gave her a new larger hide, and she still pouted and refused to eat.

Eventually I figured out she "needs" her binkie hide. As long as it's in the bin, she'll eat just fine. Even will eat in shed. She doesn't fit under it, so it's rather like kid wearing a bucket on their head. But as long as she has it, she eats, so she still gets her binkie.

Maybe one day she'll outgrow her need for a binkie but until then, she can have it. All the rest of my snakes won't use hides if I put them in the bins, so I don't bother anymore.(except for hatchlings who I often will give hides to when they do the first move into a larger bin from the shoebox bins.).