You have two options: get a second set of arms surgically added onto your shoulders to help carry your groceries, books, and beer, or attach the Portland Design Works Loading Dock Rear Rack to your commuter. If you opt for the latter, you'll be stoked on the light and strong aluminum frame, double-ply bamboo deck, and 35lb weight capacity. The Loading Dock attaches to a combination of seat stays and rear dropout mounting bosses with four bolts and seat stay clamps, so it'll fit any bike with the requisite eyelets and clearance.