Way too small for adult cats.
I bought this for my very small female cat who loves tunnels and bags. She is really petite and only about 3kg, but this was too small for her. It's a cone shape, becoming much narrower at the back, so she could not go into it and turn round, which is what cats do. All she ever did was put her head into the front and then walk away. I have 3 other cats who are certainly not large but none could have fitted in it. Needs to be marketed just for kittens really. Waste of money for me.