Crisp packets are designed with a foil lining to ensure the product stays fresh.
Today’s invention is to add some novelty to a rather conservative market segment by making more use of the metallised bags.
Fill them with helium and sell them, like balloons, attached to a string.
Helium wouldn’t stay in the packets nearly as long as air is kept out, but, given the small weight of product per bag, imagine the advertising benefit to the company that tries this out first of having people walk back from the shops with their brand held aloft.
Oops, maybe not He, given that we seem to be running out of the stuff.