Upgraded for 2011 with increased hydration capacity the award winning expandable Octane 18X is perfect for 3+ hours of non-stop action. * Ultra light 70D Ripstop pack body* Highly breathable back panel* Air Mesh ventilated Independent Suspension harness * Extra long waistbelt pockets* Central compression zip for enhanced stability / expandable cargo space* Inner mesh pocket & zipped essentials pocket* Twin elasticated pole holders* Front & rear reflectivity Weight exc reservoir: 450g Hydration: 3.0 litres Antidote with Quick Link system Max total capacity: 16 litres (zipped up ) &8211; 21 litres (expanded )