Osprey hydraulics lt 25l reservoir redospreys hydraulics lt 25l reservoir is lightweight and ideal for fast activities where the weight and balance are important the twin welded chevron baffles stabilise water whilst maintaining a flat profile while the hydrapak blaster bite valve offers fast smooth water flow with a quarter inch twist onoff switch the slick design allows for easy loading into internal hydration sleeves and makes filling cleaning and staying hydrated on the trail easie