imgoinglobal t1_iv5ubij wrote
Hydro flask makes containers that can do this in all sorts of shapes and sizes. They use pretty solid vacuum insulation to pull it off. My first hydro flask I was using to keep ice water in when I was working in Kuwait, I left it outside in the 120 degree sun for 6 hours and then when I found it, the outside was too hot to touch, but there was still ice in the bottle.
They also work excellently in the opposite direction.
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