I can't say, as mason jars aren't designed to hold pressure, but rather hold a small vaccuum after something cools. Dors it have to glass? A tin can or even pop can can hold a lot more

Ah. I don't know about adding, but a mason jar or soda/beer bottle should work fine if it's less than 10psi.

How big is your pump? Most vaccuum pumps pull to about 30 easy and use a small 4 or 5qt stove pot