I always wondered why the expiration date on our Walmart organic milk was so much later than the Publix (our grocery store) expiration date. Now I realize its because the Walmart milk is ultra pasteurized.

http://www.musingsofahousewife.com/2010/03/what-is-the-difference-between-pasteurized-and-ultra-pasteurized.html

I guess we will stick to the grocery store brand. It's the same price anyways. Am I the only one that wondered the difference?