I learnt one message early, and the hard way! All of the above ideas work, and work well. BUT, never, ever, ever, put a screwtop container of coffee grounds in the freezer to stay fresh. At least, make sure you have a rubber band around it. If you don't, the jar will unscrew, spilling coffee everywhere. The coffee grounds will freeze to all the freezer surfaces, shake into all the inaccessible areas, and you will be finding the odd bits of coffee 5 years later! (: At least coffee smells good!