Well, she's not as small as a Dahon and nowhere near the compactness of a Brompton. Here, I haven't dropped the handlebars, or seatpost, so the folded package could be smaller than in the photo. Definitely useable, but not in a busy train I'd suggest. Fairly easy to fit inside the boot of an average car - I have managed to pack both a Dahon Speed D7 folding bike and this Triumph Twenty into the boot of an estate car, without the rear seats folded and with quite a lot of space to spare. This photo was taken before I'd changed the pedals and serviced the bottom bracket.