When deciding on gear for a day trip or to the city, the Osprey Hydraulics 2L Reservoir II in blue is a practical choice. The two-liter capacity provides enough fluids for all-day activities, and thanks to its compact dimensions, the tank takes up minimal space in the backpack. Maintenance and replenishment are designed for quick use without complications, which you will appreciate when used frequently. The blue shade is clearly visible in the backpack, and the universal design fits both men and women.