An Art organizer, with sections for different utilities:
Main compartment for pencils and pens, and whatever your heart desires, with an optional divider for even more organization.
A tray in front for erasers and anything else small.
A compartment on the left for rulers and such.
Holes for pegs, where you could hook a tape roll or something hangable.
An "L" shaped protrusion of the right for hooking something larger, such as a smudge guard.
It is designed so that it can be picked up and carried with nothing spilling out.
Print the parts separately without any support or adhesion. The pegs can be later glued or 3D penned in place.