The most expensive box for the quality. Stay away
I have purchased 2 of these boxes after reading the reviews. They are not great at all! I am actually shocked that people seem to think the quality is awesome (paid review?).They are not stable, the hooks were so fragile my cats broke 2 on first use. They are also not easy to use as you are so worried they will break and it is not easy to unclip the bag. If you want to use as top entrance the little door does not stay put as cats move inside (keeps falling). The bag is not pratical to keep clean