Here are some useful reviews of the OGIO No Drag line of motorcycle-themed backpacks.

The Mach 5 is their flagship of the No Drag line which includes the Mach 1, Mach 3, and aforementioned Mach 5.  Each model adds some more advanced features such as better material, more rigid aerodynamics, extra pockets, etc.

Ogio No Drag Backpack Overview & Buying Guide at RevZilla.com

OGIO Mach 5 Vs Kriega R20 Backpacks