Top of the Line, Excellent!
The Black Diamond Epic backpack exceeds the functionality of the Black Diamond Infinity 60 backpack for faster lighter climbs and true minimalist gear loads. On any other occasion I use the Infinity 60. The Epic is also 4 season pack and very durable. For me this is essential as I've been hiking and climbing for about fifty years and I don't like re-buying gear. I also want gear that I can depend on. If you get a chance try one out at a store. Pack what you'll be carrying and see how it feels. That's always the best way to go about choosing a pack.