Much bigger than I had expected so it gives your little furry friend plenty of room to play in. I don't suggest it for hamsters because they will just climb right out of it but for your other small pets that are less likely to try to escape its the perfect size. It comes in a cute little case if you can figure out how to fold it back. I have yet to figure it out and its driving me nuts. So although this was not a good idea for my hamster it definitely will be great for other animals, your furry friend will have to decide.