I really like the concept in the Stack-o-pills design, cited in remix. However, I was thinking for travel purposes, a lid for the top modular piece would come in handy!

Original Stack-o-pills stl is also re-published here

I edited the original .stl in order to get the same thread mechanism in Tinkercad and then just added a couple cylinders. It was a pretty quick design!

https://www.tinkercad.com/things/9Kmqc5SvYVR-stack-o-pills-lid/edit