I kept my hatchling in a 4x8 tortoise table that my dad built. Easy to enclose to raise humidity. When I get another hatchling, I'll keep in in the table until it's big enough to move outside, then keep in in an enclosure like Yvonne's until it joins my big girl in the big pen (sex and temperament of the newbie pending). One day I'll get another.
Closed chamber of a large aquarium or plastic tote. I like totes better. They are cheaper and you can join two or more of them together for added room when needed.