This is fairly straight forward.  A multi-level, screw together cannister that is infinitely stackable.

I built this to have a container to carry two different items with me to work.  At some point I realized that the middle portion can be designed to screw to itself, and as many middle sectors could be stacked together as I want.

Just the top and bottom portion fits in a pocket real well.  Three levels is ok.  Four is probably ok in a lunch box or purse or table.

Dimensions:

Outer Diameter -  ~80mm

Inner Diameter - ~70mm

Inner Height - 10mm

Top & Bottom only - 21mm 

Tob, Middle & Bottom - 31mm

Middle only section adds 10mm

I tried to balance internal volume and pocket size to make it useable.  Admittedly, the worst parts of this project are getting the supports out, and when I'm down to a single mint, it makes that plastic dinging noise in my pocket which is annoying

Importantly - This is PETG with PLA supports, so if you are printing the middle portion(s), AMS is required