I am currently using glass terrariums because I only have the 2 snakes for now, once I get 2 or 3 more I'll be switching to racks. I know they suck for humidity and it doesn't really help that I'm using over head lights. Basically here is what I have in my set up: an inch or so of aspen for substrate, 2 identical hides on each side of the cage, a water bowl in the middle, and 2 plastic plants around each opening on the hide. I know in previous threads I said I was getting UTH's but I'm not good at saving money, but I'm starting to get all I need for them.
I'm making another humidifier when I can get all the supplies together.