We can all be honest and say that carrying around a bulky power bank almost makes it seem like your phone dying isn't so bad. So, we were intrigued when Anker debuted a new, very thin power bank this summer: the Anker Nano 5K MagGo Slim power bank. Now, both Anker and Amazon are running sales on it, dropping the price from $55 to $46. The 16 percent discount a new low for the power bank and available in the black and white models. Anker's Nano 5K MagGo Slim is our pick for best, well, slim MagSafe power bank.