I keep ,my seed in their original little foil packets, they are all in a paper tray, which is on a top sheld in the lobby. It is draught proof and frost free. I never keep them in an airtight tin. Especially as I collect a lot of seed and it may not be quite dry enough to store. Damp seeds rot easily if airtight. I check viability of old seed by dropping in a small amount of water, those that sink are viable, those that float have had it and can be tipped out with the water.
