What could be worse than being stuck with a battery-drained device, and without a single outlet to plug in, while you're on the go. Whether you're up in the air or on a hike, this small annoyance can turn into a big liability, should you run into trouble and need to call for help. Next time you head out from home, travel prepared with the GreenLighting Solar Phone Charger. This smart device harnesses the power of the sun to give your phone a 40% boost in battery life—plenty of power to make a call or search for directions. Available on Amazon; $39.99.