I have been storing crackers in mason jars and sealing with my Food Saver. I really like the Ritz crackers that I buy in the short stack packages. One unopened package fits into a 12 oz jar (with a little extra space at the top). They last at least 2 years - they get eaten by then.
Recently I saw the following videos on YouTube about dry canning crackers in the oven. The guy that made the first video said that the crackers are good for at least 10 years. Have any of you tried this method? Do you know the true shelf life? Is this method safer?
Dry Canning Crackers
Another video on Dry Canning Crackers