Rocketbook Smart Reusable Notebook
There are many ways to save paper but this book takes the cake. This is by far one of the most brilliant renditions of a digital note taking device. You write on it like you would on any paper and then scan the QR code and all your notes get transferred over to your smartphone. You then erase what you have written with a microfiber cloth and reuse over and over and over. This is some next level science shit. Like Spock and Leia had a baby and it grew up to be a science genius and made this. Fucking tight.