Recently, in my travels to Japan and China, I have seen a lot of electric bicycles. They are really becoming popular there. Even though the price is about the same as a gas powered scooter, Beijing, for example, has outlawed gas powered scooters, so electric bicyles are filling the need.
ANYWAY, one of the neat things that is a standard option on many of these electric bicycles is a tidy little luggage box that fits on the tail of the luggage rack. They look snazzy and practical.
Have a look at the attached picture of an electric bicycle. If you could get one of the circled luggage boxes, would you use it on your commuter? The size is about 18"W X 16"L X 12" H = 457mm X 406mm X 304 mm.
I thought they were pretty neat. They have a big reflector on the back too.