Why do you say that? I commute frequently with a small Camelbak Blowfish back pack on. It doesn't weigh me down, doesn't hinder my vision, and allows me to carry a few things. Plus, my blinky taillight clips nicely to the bottom front of the bag, putting my taillight more in line with a driver's line of sight. Granted, I have a short commute and do not have a bike with rack or fender mounts. I have no plans to buy myself a new bike any time soon, especially since i just bought my son a new bike.