Dry ice used in longer camping trips?

[Doug Bates]

Not that I need right now, but was just thinking, doesn't dry ice last longer than real ice? Can this be used for long term?

 

[smritte]

Yes, no, sort of.
Dry ice surface temp is -109F. How cold do you want things?
I would buy my ice from an ice house. They kept the ice at -10. I would buy cubes to cover food/drinks in my two mid size ice chests. In my big chest I would put blocks with some dry ice. This would keep the blocks frozen for a couple of days in desert heat. Once the cubes were almost gone, I would break the blocks and add them as I needed.

In a covered ice chest, 1lb of dry ice lasted me about two day's. If I put the dry ice in with my food, it over froze things.