Going for a big run or ride? Bring along CamelBak's superlight Octane 18X pack. Made of lightweight materials, it weighs under a pound and still totes a full 3 liters of liquid. Expandable cargo space with internal organizers gives you plenty of space for all your gear. The ventilated back panel keeps air moving to cool you off and the suspension harness delivers excellent support. Plus, the Octane even has waist belt pockets for easy access to important gear.