Stop it with the backpacks and attempting to juggle stuff as you ride. A good set of panniers is an investment in freedom, and takes the weight off your back to put it where it belongs–on your bike. You can haul food wet-weather gear, bike lock, books–whatever–in your Specialized panniers, which also come with a detachable inner bag to carry documents and smaller items youd like to take with you, and feature Ortlieb QL3 quick-attachment. Their slim design maintains a low profile, while the heavy duty zipper does double duty, making it both water- and airproof.