Each bar is wrapped in cellophane, which are then wrapped in the normal outer packaging. To make the 4 pack, they simply took 2x two packs and put them on a cardboard tray,and then wrapped those.
I don’t think I’ve ever gone through so much unwrapping for candy.
If you want to really know how much try this. https://thebigplasticcount.com/
Tracking what you use will go towards data that can be used to pressure companies and government to try to change their ways.