I am in the no "food in the tent ever" camp.

I use the bear boxes when available and hang food when they aren't if I think the risk might be high enough to warrant it.

I have toyed with the idea of using odor proof bags in addition, but have not yet done so. I would be interested to hear if others have had good or bad luck with something like OPSAK Odor Proof Barrier Bags. Do they hold up well and are they worth the expense? Since I use ziplocs anyway they would be no additional bother beyond the extra cost.