The cat playpen is a great cage to use when you need to isolate a cat due to pregnancy or illness.  It is roomy and the cats love the bedding.  They are also great for kittens who dont use a litter box consistently yet.  I dont keep cats in them all the time  because I like my cats to have more freedom.  They are lightweight and easy to move around  a room.  The bottom tray comes out from the front so its easy to remove for cleaning.