For about $6 plus shipping from the UK you can buy a packet full to the brim with nothing.
The product page says:
This lovingly crafted vial of emptiness is filled to the brim with unfettered nothingness. Free from the burden of possessions, the weight of responsibility.
Nothing is as idiotic as it is brilliant … or is it as brilliant as it is idiotic? Works either way.
We wonder if this will do as well as the Pet Rock did in the mid 1970’s?