Why are Mason jars out of stock everywhere?

The demand has resulted in supply constraints, extended lead times and recently limited product availability at stores and online, a company spokesperson said in a statement, according to CNN.

Why are there no canning jars?

Demand was way up and theres a long lag involved in ramping up production. Manufacturers saw the shortage coming but there wasnt much they could do about it. The canning supply shortage didnt stand out, because it was just one of many shortages that year.

What do the numbers on the bottom of blue mason jars mean?

Many Ball mason jars have a number printed on the bottom of the jar, but this is a mold number that does not indicate the year of production. Rather, the mold number tells you where the jar was positioned on the glass-making machine that was used to produce it.