The file 'Union Cup 3D Printer Model' is (stl) file type, size is 7.8KB.
This cup can be pushed over a 0,33L PET bottle.
The bottle used in my case can be seen on the photo - it was an orange juice bottle ;-)
The cup needs almost no space and can not slip out.
Intended for hikes and excursions.
I'm using the bottle in combination with this carabiner-clip:
https://www.thingiverse.com/thing:2901537
cup.stl | 26.4KB |