Carefresh has its place. For my gerbils who like to burrow around and play I use half Carefresh because it is nice and soft and they make little hills of it as gerbils like to do. But I would never use it as a substrate when I actually need something absorbent, it starts smelling very quickly. For something so expensive,I don't think it is worth what they charge for it, I would not use it for bunnies even if it was free.