In Spanish Diablo means “Pissed off Bull” (we are sure that is a lose translation, but you get the idea). By incorporating the newest, lightest and strongest materials available the Diablo hit a ratio of 15x, meaning it weighs less than three pounds, yet is capable of sustaining loads of 45 pounds plus. The Diablo utilizes another version of our Hypervent system that is based on 2 heat hardened stays. These act like springs when placed under tension. The result is the best circulation of cool air ever to pass through a pack