I would like a 30mm washi tape with perpendicular lines and checkboxes, so you can run it down the side of any notebook page or sheet of paper and make an instant to-to list.
MT does this measuring tape washi. To-do list tape would be more useful, and simple to adapt from this design. Please make this a thing.
Update 7 October:
I have found 45mm wide grid washi! I can work with a grid. My life is complete!