........Schutzie is confused.............
As noted earlier, a can of beer should be consumed rapidly enough that it will not have time to get warm.............that assumes that the beer can(s) at issue are cold to begin with.
But even assuming one starts with a cold can of beer, and sips at it slowly enough so that there is risk it will become unacceptably warm, the place of choice to hold the beer is between the top clips of ones life jacket, against the breast bone. And the life jacket, if one thinks about it, is one big coozie to start with. And it floats, and is collapsible for storage. And one is required to have one for every participant, whether they drink or not.
And, should a cranky ranger show up, the can of beer can be slyly pushed down and out of sight while the ranger snoops around for rascals.
So, the confusion comes from..........why would one want to add yet another piece of equipment that can become lost, stolen, forgotten, or broken?
I mean, even if the damn beer is hot, the scenery alone ought to offset that minor problem. Right?