Basement shelves, altho' the seeds may be just about anywhere thru the growing season. They are in their original packets or zip lock bags. Baskets and plastic bucket with a lid serve for carrying around.
I know it's not the best. I'm not picking on her but look
@frontiergirl53 . Closet/gardening shed? Notice her location ...

some of us in arid environments can get away with things I bet others cannot.
Now, I have to say -- I'm not especially forgiving of myself if I don't use seed in a couple of years. What? Didn't I like that variety? So, if I didn't really like it in 2009, am I gonna come around to deciding I really, really want to grow it in 2015?
I try to buy more seed than I need for a single season. Few things are more frustrating than planning on 50' of something and finding that I've got enuf seed for 10'! I also wanna cover my mistakes (or, cruel fate) and re-seed immediately if something goes wrong. Waiting 12 months when I don't have to, isn't part of my gardening plan

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I get away with ordering too much seed because the outdoors has 20% humidity most summer afternoons. By Golly, my house has about 20% humidity during winter months, too. Didn't plan it this way and my chapped digitS would prefer it otherwise. If we don't get some rain or snow - I gotta get the outside water back on and water the lawn!
Steve