The really special thing about the Traveler's Notebook is that it is fully customisable with a range of accessories and refills available. They add great functionality to what is already a beautiful notebook, turning it into an indispensible travel companion.
This is a graph notebook ruled into 5mm squares, making it easy to write and draw shapes. It also makes it easy to paste pictures and articles. Kind of contradictory, but it’s also not bad to go beyond the grids.