Everybody's got their methods and some of it depends on how serious you are about archiving them for years upon years. DRY AND COLD are the keys however you make that happen.
I happen to use tins (the kind christmas cookies come in). In the bottom of the tin, I put a bunch of rice that I've "baked" to dry out thoroughly and throw in whatever dessicant packs I come across. You still have to be careful about moisture that gets trapped inside the baggie somehow. I have some personal seed chucks that are about 6 years old with near 100% germ. I don't know how many more good years I'll get out of them, but it's not tough to make seeds last a solid length of time... but don't keep them in your dresser drawer.