This is one of the coolest travel accessories I’ve seen in a while and it’s perfect for a summer camping or hiking trip. Just screw this bottle cap onto a standard wide-mouth water bottle (it fits most brands including Nalgene, Camelbak and GSI) and it will collect solar power while you enjoy a day in the sun. At night, hit the button on top and a super bright, LED light will turn your bottle into a lantern that will shine for at least 4 hours!

$19.99 ThinkGeek