best to make sure the stuff is DRY before storing away. cure the stuff properly and you will be thankful later. Storing in a vacuum seal is such a great idea, and if stored in a freezer you shouldn't have moldy problems later on. Mold cannot grow in freezing conditions, so your freezer is a-ok. Make sure to store your stuff in a comfortable, room-temperature setting when you're ready to take your stuff from the freezer to use. Before you smoke (or give to someone else to smoke) make sure your stuff is dry and that it smells okay. If it doesn't smell quite right or if it looks and feels that something is wrong then, of course, don't smoke it. Good luck.