A paper notebook that never fills and easily saves what you write to a cloud storage? Well, yes. There are a few strings attached, but that is exactly what Rocketbook is. At the moment, the product (which will work with iOS and Android smartphones) is part of an Indiegogo funds-gathering campaign, and is set to ship out this summer (iOS version in July, and the Android one in August). Roketbook can be acquired for $25 USD.
Let me explain how this works. Rocketbook looks like a standard 8 1/2 x 11-inch notebook with regular paper pages, but embeds a few neat tricks, like the seven icons at the bottom of each page. These help you decide where your pages will be saved and all you have to do is use the app to assign each icon to a specific cloud account or email (the first page contains a legend where you can jot down your icons assignment), then fill in the respective box. Once that's done all you have to do is hold your phone's camera over a page and it will automatically be saved and sent to the designated location.
Another really cool aspect about Rocketbook is that you can keep using it even after you filled it. The catch is that you have to use a third-party device called Pilot FriXion (a pen that uses a special heat-sensitive ink). So, if you want to erase what you've written in the notebook, simply throw it in your microwave oven for 30 seconds and FriXion's ink will vanish from the pages. The good news is that when you purchase Rocketbook it ships out bundled with a Pilot FriXion pen, so you can properly use it from the get-go without any additional costs.
If you're interested in purchasing Rocketbook or want to find out more details about the product, you can visit the Indiegogo project page by clicking on this link.