They are best in an airtight packet (once they have dried off) and then kept in a cool dry place. But most of them keep OK in little paper packets. You could keep these in lidded glass jar if you like. Some are very tolerant - many keep OK in our warm utility room...

I prefer to keep them in the fridge stored in glassine packets (which I have access to). Othewise small paper packets are OK.

I keep all my seeds in small paper envelopes in a plastic airtight container in the fridge too.

Small zip lock baggies are cheap on eBay; and you can get them with a white writing strip. I dry seeds for 24 -48 hrs before storing them in the fridge (Several have even made their way to Simbad's fridge ;)) I also put a small piece of paper towel in to help absorb moisture.

fridge is the best -- in brown paper bags

Many Thanks.