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Notebooks
(sh.itjust.works)
On your note about carrying a few notebooks: I was in this same boat. I carried a paper planner, a notebook for notes and lists, and another one with graph paper for projects (wiring diagrams, building floor plans, etc). I've been using a Midori travelers notebook for the last year. It's essentially just a nice piece of leather that holds inserts (think field notes type notebooks). I have 3 inserts in mine that cover those areas and when they fill up I can replace each one individually. I'm loving it and the leather looks really classy.
For practical, durable and quality made products that are made to last.