http://www.wikihow.com/Make-Hardtack this stuff can keep for 50+ years. Y'all may already have recipes for this, but I didn't. So I added it to my collection, and thought I'd pass it along. Seems like something good to add to the long term storage, as generally speaking, it's difficult to keep just plain ol flour for that time period. Wanna kill these ads? We can help!