Survival of the fittest is in full action with a flask set that exhibits the evolution of drinking. Watch your options evolve with a set that steps with ounce advancement to cater to the necessary occasion. Go from Cro Magnon 5oz to Modern Day 8oz in one cool set. A guy could always use in a little caveman in his drinking vessel.
Barwinism is a hysterical and very practical evolution man whiskey flask set, which comes with flasks in 3 stair-step sizes. You can purchase this design as is or supply your own graphics for the box and lid. A really awesome gift for any guy that likes to take his good stuff on the go.