So you can running on peak climbs, local trail runs, or during extra races comfortably. Although this hydration pack is expensive (the price varies from $184 – $185) but Salmon hydration pack is absolutely one of best hydration pack for running. Why? Because the pack is great fit, very comfortable to wear, very versatile, and has tons of easily reachable pockets. Nathan Vapor Air 2L. Nathan Vapor Air 2L is a hydration pack for running with lots of pockets, extra storage capacity, and comfortable to wear.