They're typically uncaged INDOORS, which is very different from uncaging them outdoors. As for traveling with them being different from traveling with a cat, it's true, it's pretty similar. Apparently you haven't seen how long cats tend to last on the road. Nobody I've ever seen traveling with a cat has had that cat half a year later. The difference is that if your ferret wanders off, it won't survive; it'll be eaten or die accidentally. And it will most likely wander, because ferrets are natural explorers, and it will most likely get lost, because ferrets are terrible at backtracking. But I guess the important thing isn't whether or not an animal is likely to suffer and die traveling with you, the important thing is that until it does, you look as cool as possible.