Frozen food labeling Nirvana - magnetic mount for painter's masking tape

The best way to write the contents of the storage bags/boxes/etc. you put to your freezer is to use the thinnest painter's masking tape - they will stick and hold properly in the -18 ℃ environment.

The STL was generated to hold 2 pcs of 20x10x5 mm neodymium magnets inside. I would upload the parametric Fusion 360 design which let you customize the magnet dimensions but unfortunately, this site does not allow .f3d files.