around town i just have the stock tool kit on one bike and nothing on the other one. if i go out of town i'll take some more stuff.
on my recent trip i took 10mm,12mm, 14mm sockets, ratchet & 3" extention,10mm, 12mm, 14mm wrenches, phillips and flathead, a little wire and electrical tape, spark plug socket. it didnt take up much room with teh other gear i had. it would all fit in a normal tool bag, like what goes on the forks or something, but i think it would be a little much for around town.