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

Seals are not reusable, while the threads are. It saves a little bit of money making them separate, instead of having to buy a complete new lid every time you want to use the jar.