These are the cages I use for my mice. (Please note they aren't fully furnished yet, I wanted to be able to show you the pictures of the cage without all of the stuff in the way.) Martins Cages made them for me. If you wish to order this cage, you can contact Martins Cages and request this: CC-2414 – Modified – 24" w x 14"t x 14"d, 1/2” x 1/2”, flip-top lid with 2 spring hooks, front door with 2 latches, collapsible carrier.
Unlike other Martins cages, this one comes assembled (except for the spring hooks).
Anyway, it holds 5 mice according to the mouse calculator. They LOVE it. It, along with using Good Mews (similar to Yesterdays News) keeps the odor down. They are really easy to decorate and keep clean.
I recommend this type of caging for adult mice. I have rescued mice, not show mice (show mice are typically larger) and the rescued mice do NOT slip through the wires. I have had them slip through the BARS on the Critter Trail products originally used. It also keeps the smell down quite a bit and they like climbing on the bars. The pan is deep enough I never have anything fall onto the floor. It has what I call a moat, a space around the side of the cage and the pan so that even if they are on the side of the cage and go to the bathroom, it will not go outside of the pan.
Update: I also have CC-3018 cages - Modified 30" w x 16" t x 18" d , 1/2" x 1/2", flip-top lid with 2 spring hooks, front door with 2 latches, collapsible carrier.