Here is the process work i have started to do for my packaging design, i am trying to use a concept of how, as the range of milk from skimmed being the lowest, to full cream being the highest. It will be bought but men of that specific weight class or training class.

Therefore Skimmed - for the lowest weight day.
2% less fat - being for those having an average weight day.
and Full cream - for the biggest baddest body builder weight class.

The last two scamp pages you are able to see in a very simplistic way what i would like my bottles to look like, a protein bottle (Body-Builders) with an image of a bodybuilder lifting different weight sizes, representing the difference in what kind of dairy milk you are buying or looking to buy.