Gridfinity compatible writing tools caddy. Holds: 4 Pencils (#2) 1 Container with extra Graphite (for your #2 pencils obviously) 1 Factis Black 18 Eraser 1 Pencil Sharpener

This is made for exactly what I have so I doubt this will work for literally anyone else. That said I can modify and design something that works for your writing needs, just a leave a comment. I will do it for FREE! (just an engineering student getting some practice)