Scroll down for the list. The whole set would weight less than two pounds and fit in a coffee can.
http://www.offthegridnews.com/survival-gardening-2/essential-seeds-to-stockpile-if-society-collapses/Rotate your seed stores at least once every two years, more frequently if you are able to plant a
garden with last years stored seeds.
If SHTF, you have at least two years of seed life, assuming they are properly stored. You can expect
some germination failure on older seeds, but that is why you store enough to make up for this loss.
Even if you don't want to eat some of these plant types, they still represent trade goods with other
people. When I went through this list, some stood out as not being something which I would eat
raw, but pickling makes all things better... And if you're hungry, any food is welcome.
[edit - spelling]