Disclaimer: I don't know these people personally nor do I get a penny from them for mentioning the cat-safe enclosures they make. I only mention them because they will make collapsible/portable enclosures for people who RV (or may have a balcony where they live/rent).
I'm a big believer in
indoor-only cats since I lost so many indoor-outdoor cats over my lifetime. These enclosures allow cats to spend time outdoors sunning and watching the world go by SAFELY. They're similar to the one my husband and I made for our 4 cats. The reason I'm mentioning this particular place is people on another forum have ordered from them and have been happy with these enclosures. All the cats dearly love them. The man claims he can make them to order in any size and can make portable ones for those who travel in RVs or live in apartments (enclosure goes on the balcony) and may someday move. If we hadn't already made something similar for our cats, and already bought the Midwest cage for the RV window, I would have ordered one already. The pictures alone will give you ideas of what you can buy or make yourself. Like I said, no need to buy if you're handy and can make your own.
https://www.facebook.com/pages/Catbi...ocation=stream
Mods: If a recommendation like this is not allowed please remove it.