I've got a 2200g adult who uses the RBI large hides. I don't know how he manages to get himself in there. Usually they are about 1/4 to 1/2 off the floor. He almost wears them like a turtle...LOL. I figured they were too small so I went and spent like $100 for two of those Zilla jumbo rock hides. They were roughly the same size inside as the RBI, but they were taller, had a large opening and weighed about 20 lbs each. The snake apparently didn't like them. All the sudden he started hiding his head in the water bowl. So, after a week I put the RBI's back in. they are lighter, and yes, way easier to clean....