A cup is bought on footprint and stability, not capacity. A narrow base tips when someone reaches across it, and a cup that takes forty pens just means forty pens are never sorted. Mesh and perforated designs let you see what is in there, solid ones look tidier on a reception counter. Weighted or wide bases matter most on shared desks. See desk organisers if pens are only part of the problem.

Black pencil cup on a bright office desk holding pencils, pens, scissors, ruler and highlighter with notebooks and desk accessories.
Pencil Cups for Desk Organisation

Shop pencil cups and caddies for pens, pencils, markers, scissors and tidy office or classroom desks.