Xiaomi Mi Power Bank
If you use your smartphone or tablet heavily, you might need to juice up while on board. Budget carriers do not typically provide power points on board and if they do, you probably have to pay to use them. Even on the full service carriers, you might have to share the power point with your seat mates. Weighing just 350g, Xiaomi’s new 16,000mAh Mi power bank comes with two USB ports and lots of juice to ensure your devices never run dry.
Pro tip: They're so affordable, you can get a couple of them without making a dent in your monthly expenses. Why carry tiny power banks which weigh almost the same, but provide a fraction of the charging capacity? You'll never have to run out of battery (unless you forget to charge the sources themselves).