If you have a vacuum sealer, you can use that and stick them in the freezer until you need them again. If you don't have a vacuum sealer, a ziploc bag will do ok.
Oh, no, if they are still in the nice silver vacuum sealed packs, that's best! They can be frozen just like that. I have several unopened packages in a ziploc in my freezer- just to keep them all in one place and not loose in the freezer!