Co2 will displace oxygen and you will get light headed in closed tifgt quarters. I have seen it happen in trandport so keep it outside. Freeze the shit ouy of an already frozen cooler for travel and it will take days for anything frozen in the ice to become accessible. I have filled the bottom of our cooler with blocks of ice then 2-3 inches of water and frozen it with dry ice. This could easily be done twice or 3x as long as you can keep the cooler out of the heat.
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I am a river, babe - I've got plenty of time, I don't know where I'm going, I'm just following the lines..... - "We are water" by Shaye