The 2-liter Hydrolight reservoir gives you hydration and illumination in one. Made of ultra-durable, abrasion resistant PEVA & RF, it is 100% BPA & PVC free, features a slide-lock closure for fast fill & easy cleaning, and a 36” drinking hose with a leakproof bite valve. But what really sets it apart, is a small integrated pocket for your headlamp. Put your torch in the pocket and its light is diffused through the water to light up your tent or campsite.