If you are not familiar with Rocketbook, they make reusable notebooks and originally came out with the Rocketbook Wave. While the Wave's concept of using a microwave to erase your notes is pretty cool, it does have a limitation of 5 uses per page, and well of course you need a microwave. Then they came along with the Rocketbook Everlast, which promises unlimited uses and simple erasing with any damp towel so long as you use the right pen.