Necessity is the mother of invention, but has no familial relation to good design. Sticking two cups of different sizes together and hoping they don’t spill is medieval (not literally, it’s actually 19th century), and even in modern shakers, the process of getting the shaken beverage out of the shaker is sleight of…
Koozies. They keep your hand from getting cold and your beer from getting warm—what could be better? One that keeps your beer cold for much, much longer, that's what.
Here's the hard data and size comparison pictures to accompany the outdoor sleeping pad comparison. Hopefully this gives you a substantial ability to compare the pads and draw your own conclusions.
You take beer seriously. You want it as pure as it was the day it left the brewery—untainted with light and heat. You want the best beer possible, and you want to take your time drinking it. Do you want a 64-ounce wide mouth vacuum insulated stainless steel growler?