You may consider some throw over saddle bags. So you don't have to leave them on or have those goony looking bars attached. I use to use a set of horse saddle bags "pony express bags". Throw them over the pillion and head out. Get to work throw them over your shoulder and head in.

I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago. Edgar Allan Poe