I keep mine in pretty photo type boxes from the craft store, alphabetically, between dividers. I keep my morning glories in their own box by year so I can match up the pictures.

At the moment, I think I might use a craft box (like a jewelry/bead craft box or a box with smaller, flat boxes in it like I just bought for my mother in law).

Thank you all for the seed storing ideas, I'm always looking for better ways. I'm also looking forward to growing the mammoth sunflowers!

@Chillybean, please tell your son thank you for the ID on the pin oak acorn.