Outliers Notebook is an eco-friendly notebook you can erase in your microwave and reuse up to five times, thanks to a special Outliers Pen that uses a temperature-sensitive ink. 
The idea behind it is simple: instead of throwing or storing away a notebook you’ve just filled up, you can scan your notes with the Outliers smartphone app and archive them digitally on the cloud thanks to a QR code printed in the lower outer corner of each page, adding tags and keywords to them to make it easier to look them up afterwards. Then you put the notebook in the microwave to erase it and start all over again for up to five times.

In case you don’t have a microwave, the notes can be cancelled by blowing the notebook with an hair-dryer, or just with any other solution that will keep the book above 60° for a sufficient amount of time. Previously written notes are not lost forever, though: they can reappear if you store your Outliers Notebook in the freezer at -10°. 

Price: 25€. You can order it from the official website.