Agreed, the bath containers are not left in there continually, but I will let then have "bath time" in which I choose not to have plastic which they will chew on. Other than the fact that it is cheap for companies to produce, I don't understand why so many of the products for chinchillas, hamsters, etc are made of plastic when it is horrible for them. I do like the Super Pet ceramic bath house (the big chinchilla one) but they really aren't big enough in my opinion for a full grown chinchilla. I love them for the smaller ones though.