InkCase

The screen on your iPhone 6 is big. Which also means it's power-hungry. Give yourself quick access to your most-used information without the battery drain by putting your phone in an InkCase. This intelligent accessory puts a 4.3-inch E Ink display on the back of your phone, connecting over Bluetooth to let you display things like boarding passes, payment cards, or even notifications. And it measures only 4.2mm thick, so even with your iPhone inside, the whole package measures a still-pocketable 11.1mm, or thinner than an iPhone 3GS.