CamelBak has specced the Mule large enough for even 3+ hours of performance. With 9 liters of cargo space in addition to a full hydration bladder, it can carry tools, extra clothing, energy bars, etc. The total volume is 12 liters, ie you can carry approx. 9 liters of cargo even when the bladder is full Length of the hip belt 66-116cm Dedicated pocket for media player and other small accessories The shoulder strap has a magnetic holder for the drinking head Helmet holder 3-liter Crux hydration bladder with QuickLink holder: the hose can be easily removed, eg for cleaning Large opening for easy filling Big Bite drink head Material and manufacturing defect guarantee: backpack 2 years and beverage container and hose 10 years. Measures: 45 x 21 x 20 cm Volume: 12 L Weight: 815