The Dahon Carry on just came. Its pretty slick. It comes in a saddle pack, so its always with you. Down side being that you can't lower the post as much with it on. Not really much of a problem. Anyhow, you whip it out and pull it inside out. There are two strap you run through the wheels and frame, through a plastic hoop bit, and then velcro to itself. The bag then folds back over the bike and has a drawstring at the bottom. reverse the process to get it off. Pretty quick. I was also able to get the bag back in the pack without any specific folding. You can just stuff it in, and it'll fit. It should be noted that is in no way makes the bike and sort of luggage. The fabric is thing, and there is zero padding, but it should satisfy the metra conductors.