Let’s say you are biking out somewhere, and then you & your bike will get a ride in a car. By “bike”, I mean a gas non-fold-up bike that may need to be kept vertical (or maybe something can be done to allow non-vertical transport). You don’t know in advance what kind of car is going to carry you and your bike, and you can’t advance prepare the car. What kind of rack or equipment, that can you carry with you on your bike, would facilitate the car carrying the bike?
Some ideas
Some ideas