Alright so if I go the rubbermaid route, then I will probably build a rack later on. What is suitable for an adult male/female enclosure? Before I sold my babies last year, i would always remember seeing my snake roaming around the cages at night. If i get a rubbermaid that is no larger than a foot high, they won't be able to stretch upwards...that's ok?

What about length? Is it really vital that a bp be able to stretch out? Since I will be starting out with only 2 or 3 snakes, I will be able to spend time with them out of the enclosure, letting them crawl around and stuff.