My kitties, being the fussy spoiled darlings they are, are not allowed to roam outside. Being Persians, they are also not equipped for a rumble so the next best thing is a cat enclosure. Not a cage, an enclosure. While they are confined they are not cramped. The one I chose was the 505 which has two levels and two perching shelves, is roomy enough for six to stretch out and has two doors. It has held up for about 10 years now. It is fully collapsible(with an allen wrench) and breaks down to fit in a large carrier bin and even when fully assembled, while bulky, does not weigh too much while being very sturdy. Now I can leave the furries outside to enjoy the view without worrying that they will wander off or that something can get at them. In fact when I say«Kitty Kat Kondo» they run to the door and right out into it. Schweet!