Legos. Even in a TEOTWAWKI situation, people will want to trade for something their kids can play with.
https://www.cnet.com/news/lego-bricks-outshine-gold-bars-as-investments-report-says/
I have been watching the GameStop GME thing because I find it fascinating. If you go to the actual Reddit pages you'll see tons of posts disputing the "Reddit moves to Silver". In fact, they say this is just a diversion tactic by the hedge funds to try and get people off of GME.
Just one...