I always buy the big jars of instant dry yeast because i dont' like the mess with the individual packs but i always end up throwing about 1/2 the jar away at the end. Question is can you freeze it? I would think if you froze it then the yeast would almost last indefinitely. Another idea, since i have a foodsaver type device on the way, would be to put the yeast in one of those vacuum canisters. I would think that would essentially do the same thing. Any thoughts?