Hi Buddy
After your seeds have COMPLETELY dried put them in an air tight container like a marmelade jar or something like that - in the freezer it goes. You can store it in the freezer like this for many years. The amount of seeds that will sprout will be smaller as the years go by, but freezer is the best way. Even if you have any seeds that you are going to plant - put them in the freezer for 24 hours increases the percentage that will actually sprout.
Marijuana seeds are pretty rough and will survive in an ashtray, bag, bucket or whatever. Just keep the seed dry, dark and cold if possible.
Hope this helps you.