I thought this might be of interest on the car-free forum.
I need to rent a car for a work trip this coming weekend, and the car rental place is about 3 1/2 miles away. There's nobody available to take me there or pick me up when I get back, so I'd determined to walk. I was wishing there was a good way to get there on my bike, but the hassle of having to take the wheels off to fit it into the trunk of the rental car turned me off to the idea.
I got to thinking that it would be really great if there were a compact, lightweight, collapsible carrier that I could transport on my bike, and then use to load the bike on the car. I'm probably not the first person who wished for something like that. I started to write it up and make some sketches, and then said to myself, "This is so obvious, somebody must have thought of it before..."
Sure enough, here it is. Holds one bike, is less than 7 lbs, and folds up small enough to fit in a backpack, all for less than $40. Apparently, they also make 2 and 3 bike versions.