Here is a portable, waterproof emergency light that can also serve as a smartphone charger. The SunJack LightStick has a 5200 mAh battery and is waterproof to 6 feet. You get up to 46 hours of lighting on one charge. This 350-lumen light is equivalent to a 40 Watt incandescent bulb.
The LightStick has a rugged design and 3 brightness levels. It is snow-proof, dirt-proof, waterproof, and shockproof. This versatile tool could prove useful for camping, hiking, fishing, and emergency situations.