Ok, here's my story. My wife and I quit smoking pipes back in the early 1990s. For some reason, I kept all the tobacco we had left. Some was in jars, and some was in bags. About a month ago we decided to start smoking them again. ( we just missed them, and she never liked cigars as much as I did ) I dug out all the tobacco I kept to see if it was usable. With the exception of one bag, all the bagged stuff was dry, dry, dry! The stuff in the jars was all usable, some a little dry, but most just as I left it. The only exception was a large bag of one of my favorites, Plumcake, from Poor Richard's Pipe Shoppe in San Bernadino, CA. I had put a 1lb. bag which was tied with twist tie, inside a zip lock bag and it was just fine. I have no explanation for this, other than it was a large amount. All this tobacco was at least 20 years old! I had LOTS! of little baggies of misc. tobacco types from all over So. CA, some had no name on them as they were just samples given to us from different shops. The only thing I knew, was that they were all aromatic. So I took them all and put them in a sealable plastic container with a wet sponge setting next to the tobacco, but not in it. After a few days of stirring it around it was fine and ready to smoke. So along with the Plumcake, the stuff in the jars, and my reconstituted mixture, I had over 2lbs, of tobacco to use!
After all is said and done, I'd have to say that for short term, baggies are fine. Long term, or larger amounts, I agree with the others, use jars. ( and oh yeah, I still ordered some fresh tobacco just the other day, I don't know, just felt the need for something new I guess ) Happy smoking anyway!