This is simple, Take an empty and clean metal coffee can, throw away the plastic lid, place seed packs inside and cover top with aluminum window screen and duct tape it around the sides of the can. This will allow air to circulate, humidity will escape from seeds and bugs and mice can't enter. Keep the can in a dark and dry area, I prefer the floor of a bedroom closet. Seeds have been found in Egypt and elsewhere that have been good after more than 1,000 years!
