Thanks 7.62x39 militiaman. I would suggest that you buy those non refrigerated milk "juice packs" if you are planning on using milk. That way you can have them anytime without the worry of spoiled milk. Is Muscle Milk the same way? Do you have to keep it refrigerated?

My father and I used to this when we hiked sections of the Appalachian Trial. Powder plus milk pack...all you need until lunchtime.

Plus you can mix the powder into anything you can think of: coffee, your own energy bars, etc.