I mean, you don't like small wheel bikes, I've got it. But you can get just about anything now bike-wise that will fold and fit in the trunk of a Civic or whatever no problem. And they're nice, too! Montague makes some very nice ones.
Front suspension MTB with 27.5" wheels?
https://www.montaguebikes.com/produc...oper-highline/
Hybrid bike with 700c wheels?
https://www.bikecraze.com/Montague-U...urban-dc21.htm