This Portable Battery Pack
It never seems like a big deal when you spend your entire flight playing Angry Birds, but the moment you land and find that you barely have enough battery power to call an Uber, you realize you've made a huge mistake. Fortunately, you can grab a mobile battery like this monster 30,000-mAh power pack. Fitting easily in a luggage pocket, this juice box can charge phones, tablets, and MacBooks, meaning you can fire birds at pigs the whole flight long. Not literal birds and pigs, though. It's not a miracle worker.
Get it for $59.99, and save over 50 percent off retail.