It is always helpful to have a portable charger on hand, and the uNu Ultrapack (available on Amazon, $49.99) is one of the most reliable chargers available. For only $50, the Ultrapack comes with two USB ports, which can be used for nearly every device, a long-lasting battery, and a screen on the charger that indicates how much time is remaining before it is charged and how much battery life it has left. The Ultrapack also has an LED flashlight built in for night-time use or emergencies.