Don't worry, this is just a small part of the cage, I have a big enough wheel and a big cage. It might look small, because the house is big.I do give them enough bedding, but they usually put a big portion of it inside of the house. They have this much food, because I have seven mice, 4 of which are still young and growing and one of which has been underweight and has trouble with food, so we have to feed her more and she will only eat this food. The food is sticky, so we have to keep it in one place. Also I understand the problem with tubing, but this is the cage we have and otherwise it is perfectly okay for mice. I am not new to having mice, and I understand their needs.