How long you storing for? Long term? Years? I put them into little plastic or glass viles with a bunch of moisture absorbing beads. Like in those little packets that come in your new shoes. Then those go into a mylar bag with a full pack of the moisture absorber, then that goes into a freezer ziplock bag (that has more of those packs in it) and into the butter compartment in the fridge. I've cracked 10yr old seeds with little issue. (Old tga subcool stock). You can freeze them too, but I have no exp with doing that so I cannot comment on the effectiveness of said method.