With most of us carrying phones and tablets these days, it’s easy to get caught without a charge. The Mophie Juice Pack Universal PowerStation Duo is the company’s answer to that modern headache.

The devices’ 6000mAh rechargeable battery can provide up to four full charges for most smart phones, and since it has two USB ports, it can charge more than one device at once. It’s small enough that slipping it in to your bag shouldn’t be a problem. Next time I travel for work, I might just have one of these with me.