Whether you spend a lot of time outdoors, or you just want to be prepared for an emergency, this 20W Aukey solar panel can charge two USB gadgets at once using the power of the sun. You can even clip it to your backpack to catch some sun while you hike up a mountain, or just walk between classes. [Aukey 20W Solar Charger with Dual USB Port, $40 with code 7HP5VBL4]
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