Is there a term for the principle governing the efficient spatial arrangement of items within a container?

This question was prompted this morning (and yes, it's silly) when I opened the refrigerator to see (yet again) that someone had placed several short items on the top (tall) shelf, usurping space from items that can't be stored on any other shelf.

Maybe it's as simple as spatially efficient.

(Yes, I realize I should maybe be posting this in OCD dot stackexchange dot com.)

It's called, at least in Mathematics, simply packing. See Packing problem and, what I believe is the most common instance of the problem, circle packing.

Borrowing a term from the U.S. Air Force, you might call it dense-pack.