I'm only able to commute two out of four days (days I don't have drawing classes) to school because of my portfolio case. Its an 18x24 flat nylon bag that carries my drawing pads and other art supplies. I was wondering if you guys have any ideas of a way to attach this case to my bike. I realize that it will catch wind like a kite, but I'm willing to give it a try. I ride a Fuji Del Rey fixed gear with a rear rack. My commute is 24 miles round trip and I go through Downtown Detroit.