The Black Diamond Distance 8 and 15 packs recently came out. My first impression of the Distance 15 is that it could be a strong contender to de-throne the Osprey Daylite as a favorite run commuting pack. My first impression of the 8L was that it was obviously too small to hold a laptop and other stuff I need. I’m sending it back unopened.
About the Black Diamond Distance 8, I’ll briefly say this: It costs about the same as the Distance 15, it weighs about the same as the Distance 15, but it carries only about half as much. The Distance 15 comfortably handles with small or mostly empty loads. The Distance 8 is more of a single-use product while the Distance 15 while find users around town as well as on the trails.
Distance 15 easy access up front 
Distance 15 all-business storage in the back