City slicker boy bag
You'll get some snarky comments and condescending stares from hip trendy fools that put brakes on their bikes, but this bag feels great and is VERY functional. The bag has hefty waterproof cordura, and the tarp liner is a lifesaver for cleaning and for not having a soggy back if stuff spills or sweats. It also creates a huge stash pocket also, handy for sneaking your "water" into concerts or what have you. Specific U lock pocket, the quick release, and color scheme are just icing on the cake.