Meet the Sony DPT-RP1: a super thin document reader with an e-paper display, WiFi, and Bluetooth that lets you store thousands of PDF files on it and read for up to 3 weeks on a full charge. It comes with a pen for taking notes and interacting with documents.
The device is as thick as about 30 pieces of paper, weighing about 12.3oz. It comes with an app for Mac and PC computers. You can transfer documents to it via WiFi or Bluetooth. Digital Paper comes with 16 GB of storage built-in.[where to get it]