A simple magnetic bag hook.  It requires ten (10) magnets (I used – https://www.amazon.com/DIYMAG-Neodymium-Magnets-Double-Sided-Adhesive/dp/B081W5P4GD).  This will hold about 5.5 lbs of weight.  Mine is stuck to a painted metal surface so it will slide if I drop it onto the hook. You could shave off a layer between the outside surface and the magnet compartment to get better grip too.  Assembly is easy… just insert the magnets in the slot of the hanger and then superglue the tab into the side.