What can I say…. It's an ordinary cup. Store pencils in it, paintbrushes, toothbrushes, or even, if you're a little crazy, ballpoint pens. But I can't guarantee those will work with the cup. It has a super cool slot in it for extra aesthetics, so maybe don't try to drink out of it… Or do if you're feeling adventurous!
BONUS FEATURE
If you place the cup upside down, you can put another cup on top of it to assert dominance over other inferior cups.