I ride my race bike and carry my stuff in a backpack most days. Like most masters racers I know, I have to work and I have to maximize the efficiency of my training time. Since I have to get to work and I have to train, it just makes the most sense to combine the two. Some days I'll even ride to work with my race wheels if I've just glued up new tires or I'm too lazy/rushed to change wheels and brake pads. The anti-racers might find it ridiculous, but whatever.