...I have one rack of ten 24 inch plastic boxes and one rack of five 36 inch boxes. Both of these racks are made of heavy melamine. They have a very tight fit and there is very little airspace around the top of the boxes. I have small holes drilled in the boxes to provide a small amount of ventilation. The very limited ventilation is key to keeping humidity inside these boxes. I keep Rainbow Boas that are less than 4 and a half feet long in these boxes.
This first PIC is the rack of 24 inch boxes.

I usually use newspaper substrate in these boxes. When I have a new litter of babies I put bunches of them in these boxes on papertowel substrate. As I get them sexed and sorted out I move them into individual smaller plastic boxes. The water bowl is a big part of keeping these boxes humid. I usually spill a little water from the bowl on the substrate whenever I open the cage. A couple ounces of water spilled on the substrate supplies more humidity than several minutes of manually squeezing a mister. When I open one of these boxes this is what I often see. The snakes hide between the layers of newspaper.

When I go into cages with a camera I have to shoot a PIC of the cage inhabitant

This is the rack of 36 inch boxes.

Open the drawer and sure enough the snake is hiding between the layers of newspaper. I even provided her a special piece of PVC to hide in. Oh well.

There is a snake in there. I pulled her out for PICs.

And a closeup.

>>Can you post some picts of your set up enclosures. how do you keep humidity for them on newspaper. I am wanting to make my set up less dirty and moldy. I have had some problems with this in the past. If you could just take a few picts of the whole set up, so I know what I am going for.