I came across an interesting article in the Wall Street Journal about Coca-Cola's new efforts to downsize it's packaging. They are approaching this not from the financial considerations of the ingredients (unlike the ice cream market) but from an effort to address shoppers who are watching their calories and watching their wallets. 16 oz bottles are now being introduced at a 99¢ price point and Coke seems fine with basardizing the sales of their 20 oz and 12 oz cans to do it.
Read about it at The Wall Street Journal or at Forbes.