Chris C wrote:dry ice is much colder than regular ice and doesn't leave behind water because it evaporates...........but it doesn't last any longer.
I dunno. I too use the three cooler method for long desert camping trips:
1) cooler for bevs and snacks, that one will be in and out of.
2) cooler for other foodstuffs, where one limits access to.
3) cooler for block ice and frozen foods, which contains dry ice.
The dry ice will keep the block ice and frozen foods frozen for 4-5 days. After the dry ice goes, the frozen stuff goes to cooler 2, and I redistribute the ice to coolers 1 and 2.
It can be dangerous. Handle it only with gloves. And keep the ice chest it's in in a well ventilated area. If you start to pant, it's not ventilated enough.
This site give a tonne of info on it, the
safety and
camping sections apply:
http://www.dryiceinfo.com/
rob