I use 1/2 pint wide mouth Mason Jars. If I want to "preserve" the freshness I use a foodsaver mason jar attachment that works real well.....when you can get it to catch. The 1/2 pints are much easier due to the flared out jar body being close enough to the lid. That closeness allows the foodsaver attachment to rest on the jar body, making a better seal for vacuuming.
If I want to age, i.e., have nature do it's wonderful nanobit dance, I just close the jar fairly tight by hand. So far, the longest I've kept tobaccos that way was 2.5 years, and it was Dunhill Night Cap and Squadron Leader. They both mellowed a bit, and were very nice, with a nice underlying sweetness. I'd say that they were more palatable than when fresh. I will qualify that by stating that I am predominantly a VA and VaPer smoker.
Once I open a jar, I plan to smoke out of it fairly regularly. I just keep using the same lid. When I go to re-use the jar, I then use a new lid.