"A plastic ceiling tile meant to cover fluorescent lights, cut down and inserted into a box for organizing and carrying copic markers." But not only for copic it can be used for any other marker or color pencils
For Copic Markers - This is a cheap CD holder with a CD case in every other slot! You can take out the paper label and color its spine to match your marker pens, put it back in the CD, and put your markers on the CD shelf.
Found a solution for my pencils, markers, and pens. Found this box at and bought a ceiling tile at - easily cut to size with wire cutters. Made two levels of the grid, using smaller pieces to support. via Erica Fetterolf