This is a very expensive unit and it’s advertised that shelves, etc can be attached. I bought two shelves and the walls of the catio are so flimsy that if my cat jumps on the shelves the entire cage shakes, so of course my cat doesn’t use them. Overall, this is a very expensive catio and nothing can be attached. I also feel this is false advertising with the shelving system as the cage is too weak to attach anything to the walls. Disappointing for the price of the everything
