acerbis zaino sather 9l9L backpack with hydration bladder and X closure, ideal for those who need a water reserve during offroad outings. Backpack capacity: 9 liters. Exterior with rubber coated fabric panels, making it easy to clean the backpack with a wet sponge and improving water resistance. The innovative X closure system, with a central quick release and 4 velcro adjustments, eliminates oscillation and simultaneously distributes shoulder strap pressure evenly across