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It really depends on how extreme you want to go. MRE's are great but my fave for packing/survival kits is datrex rations. They're pretty cheap and a small little thing filled with 12 little bars that pack 220 callories a peice are great, and very small. And unlike a lot of other rations, they taste pretty good. Basically like an old cookie. And they can last longer than dirt as well, the ones I ate were like, what, 4 years old?