SPRAY TO DRINK. SPRAY TO COOL. SPRAY TO CLEAN. SPRAY TO SHARE. Add a GEIGERRIG filter, and clean the water it travels through the drinking tube on its way to your mouth or to the mouth of those traveling with you. 15-20 squeezes of the pressurization bulb will drain the Hydration Engine (Reservoir). Add a squeeze here and there to maintain the desired pressure and spray. NEVER SUCK AGAIN. Measures 22 inches long by 11 inches wide.