How about 1000 or so plastic lids from those plastic preserved fruit containers ,used for paint mixing and glue palettes ,then there is the foil that seals the container ,then the container when its empty.
Individual serve yoghurt containers are good when emptied , just need a rinse.
The miles of copper wire from broken electric motors , stripped down DVD and video players ,tons of stuff in them .
The lead foil from the dentists xray thingies......etc etc etc