I, too, am puzzled by this question about "dorky." You're either going to be a bike commuter or you're going to let your imaginary perception about what other people think about your trunk bags ruin the whole experience for you.

Trust me, man. Nobody behind the wheel of a car or on another bike gives a sh-t about your trunk bags. Buy the Topeak system (I have the MTX DXP version for some extra room) and get out and ride. Life is too short and unpredictable to worry about kiddie stuff like "dorky" bags.