This is a place to keep salt (or other spices). The lid is held on only by magnets and slides off easily, so it's not secure if you drop the container on the floor, for example. However, I've been using mine for several weeks and have suffered no spills. And it sure is handy.

The stl file was made for the 2mm x 3mm cylindrical magnets - I got mine on eBay, though I've seen them, sometimes, on Amazon.

I plan to put the scad file into Customizer to allow easy changes to the cellar diameter, height, magnet shape, size and count and, perhaps, customized text for the lid.