Now before I get started let me just say I don't have anything against keeping snakes in racks or tubs. They can be great enclosures and they hold humidity better than the traditional tank with a mesh lid. Nor Is this intended as an attack on another forum member. I just happen to disagree with this method of keeping reptiles.
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Now, as I stated before I don't have anything against racks but keeping your reptiles seems downright cruel to me. They don't even have enough space to stretch out. Which is how I go about picking enclosures. If they eat, sleep, breed and poop I guess they're fine but that doesn't seem like any way to live. I consider the minimum a water bowl of some sort, a hide, and a enclosure large enough for the snake to fully stretch out in. As far as I'm concerned if those are met and humidity and temperatures are correct than it doesn't matter what enclosures you keep them in.