Graham Sutherland🎃 / Polynomial.pdf.exe on Nostr: e.g. this. lid slides under the lip. or could put the openings on the outside edges ...

e.g. this. lid slides under the lip.

or could put the openings on the outside edges instead - either works.

this also works great as a funnel fill port. I have the same on my AMS desiccant containers.