600D Ripstop with a water resistant coating. Two front zippered pockets contain media pocket and name card holder. Inside the zippered main compartment is a pocket for an optional (H2O) hydration bladder. Two side mesh pocket, webbing gear attachments and bungee cord. Uses Air-Bridge system with foam and air mesh on back and shoulder straps to keep you cool. Precise fit with compressions and adjustable straps on the front, shoulders, sternum and waist. This pack is (H20) hydration compatible. Upgrade with the HF00 2L bladder.