Delfonics is a Japanese design firm known for impeccable quality, thoughtful form and one of the best color palettes in stationery. 

This notebook has a resilient, heavy cloth-like cover that shrugs off the occasional raindrop,  fountain pen-ready grid paper -- lightly rendered for note-taking versatility -- five practical cellophane sleeves bound into the back and an elastic closure. Spiral-bound to lay flat when that's important. Perfection.

5mm x 5mm grid
Five cellophane sleeves in back

Large     
140 pages
5.5 x 7"

A5
160 pages
6.5 x 8.5"