Goal Zero Extreme 350 Power Pack - $251.99

Store power from your solar-powered base camp, or use the Extreme 350 Power Pack as a battery backup when you're far from the grid. This Power Pack serves as an add-on to your Extreme 350i Power Pack and Universal Inverter to boost the power you can have on hand to keep your electronics charged and light up the night. A tough casing, rubberized handle, and highly weather-resistant construction mean you can put this pack through the paces from Everest to your base camp in the desert. - $251.99