In a world where stress is in surplus, the last thing you need is your phone, tablet, or laptop dying on you. We rely on our devices for essential tasks from finding directions, getting help in emergencies, and communicating with our loved ones. So why feel that little pang of stress each time your battery slips into the red? A power bank is a must-have tool for anyone living a busy life on the go. It can provide power for days, charge multiple devices at once, make you more effective at work, and provide a sense of comfort and convenience when you travel. To help you take charge of your life, we put together a list of our favorite power banks on the market today.