Clip-on clean/dirty toggle (laundry/packing cubes)

I've got these packing cubes for my clothes when I travel, and it's much better than just having a pile of clothes in my backpack. But I'm always trying to figure out which ones contain my clean and which ones contain my dirty clothes. This little toggle solves all of that. Just clip it on, and slide the toggle to indicate what it is.

I used some paint markers to color the circle and squares just to make it even easier to see.

Design by rtwfroody on MakerWorld (license: BY-SA).