Do you go to work or school on your bike? The Black-Roller Urban QL2.1 is a single bike bag that you can attach to a separately included carrying system. This means you won't be bothered by protruding hooks that may touch your skin during your bike ride. On top of that, you can easily place the bike bag on your bike rear rack with a single movement. And, you can just as easily remove the bike bag. If you have to ride in the dark, you'll be visible to oncoming bikers, thanks to the reflectors on the sides of the bag. And is there a rain shower on the way? Don't worry. Your laptop and books will stay dry, because the bag is waterproof.