I'm thinking an airtight bin in the freezer with ziploc type freezer bags inside full of seeds. This way I should be able to thaw the bags of seeds I want at a given point in time without having to thaw the entire seed storage to prevent condensation.Storing seeds. If they're in the packets, tape them shut if they're opened. I have mine in a plastic bin on a shelf in the mudroom. It has to be mouse proof. It's chilly out there too.
Seeds from my own plants are in small envelopes, marked with what it is, and what year it was grown. Make sure they are DRY before you seal them up, or they can rot or mold.
Really long term, you can store them in the freezer. In fact, there are thousands (millions, maybe) of open pollinated (non-hybrid) varieties of seeds being store in Norway, I believe, in a very cold, secure location. Leave them in their container to bring them back up to temp to avoid condensation on the seeds.
Thanks for the tips.