Eli5, why do Mason jar lids typically come in 2 parts, threads and seal, as opposed to nearly every other commonly used household container?

Question

Eli5, why do Mason jar lids typically come in 2 parts, threads and seal, as opposed to nearly every other commonly used household container?

In: 7899

Answer 1

You’re focusing on the lid. Yes it’s two parts but as a whole, the jar only works with the lids and vise versa. The glass can be slowly heated up and filled and then apply your two favorite parts. The seal and the threaded capper. As it cools, it seals the contents inside creating a vacuum. combine these three and you have yourself food for up to two years

The point is to remove the oxygen from the container so that nothing inside spoils.