Here’s a cool idea: an e-ink phone case. Slap an e-ink display on the back of a protective case, and you suddenly get to use all that previously empty space for something actually useful — seeing notifications, reading books or checking off your shopping list. Best of all, even if you read for hours, you’ll barely touch your phone’s battery life, because e-ink screens are so power-efficient. In fact, you could even fit in a small battery and use that to charge your phone. That’s exactly what Popslate have done with their latest case, and it’s coming soon. Let’s take a look.