Why going through all the cost and hassle with dry ice? Just pack extra
ice in a separate cooler that doesn't get opened every time someone
wants a drink. You will be surprised how long it lasts.
IF you want to go high tech and do have access to lab freezers (where
else would you get dry ice..., you can also 'supercool' your normal
ice before the trip. Ice at -70 C will last a lot longer than at -3 C,
with no extra weight. Glen's caveat about heat conduction still
applies.




cavelamb wrote:
Anyone out there use dry ice for refrigeration?

I want to keep the cooler cooler longer.


A couple pounds of dry ice seems like a good idea,
but how to use it?

Mix with wet ice?

Or keep separate?

Richard