I use the Osprey Momentum. It is made for cycling, fits great, has four pockets as well as two main storage compartments, each of which is divided into two sections, an attached nylon rain cover that tucks away when not needed, a loop for a blinkie, an elasticized strap for my helmet and a lifetime guarantee. It also comes in a nice bright yellowish color that is hard to miss. I am very happy with it.