Earlier quoted context omitted.
A lot of packaging is sourced from China. Things that wouldn't otherwise be a problem will become a problem. Potentially that includes bottles, tins, plastic food packaging, niche carboard boxes. Imports from China are ~40% of all US imports. Even a 10% drop would be difficult, and at current levels it's going to be more than that.
> Imports from China are ~40% of all US imports You mean 14%? https://tradingeconomics.com/united-states/imports-by-countr...
So I suspect 40% figure is how many items in a typical household are from China.
Edit: in case that's not clear, here's an example:
I have one item from the USA that costs $80. I have four items from China that cost $5 each.
My imports from China are 20% of my spending. My imports from China are 80% of my goods.