https://www.amazon.com/gp/product…ZVNQ9LP7N9

High Energy Conversion: SUNPOWER highly efficient solar cells convert up to 21.5-23.5% of solar power into free energy. Charge up to two USB devices simultaneously and forget what it feels like to have to look for a socket.
Compact Size: One of the most compact solar chargers on the market. Benefit from free solar energy in a lightweight foldable format you can always carry with you no matter where you go.