folding up cardboard boxes sounds straight forward enough, but what do other people do with the plastic inserts or plastic bubbles from cardbacks?

i have a fark load of 150L plastic containers at home. Each one is jam packed with packaging from all sorts of TF lines....it feels like playing tetris every time i pack something away just to try to make it all fit and optimise the space.

I've been wanting to flatten all the TF boxes but i cant bring myself to throw away the plastic!