OK guys I need help again, I am getting ready to go on a fishing/camping trip to Rainy, last year we were borderline on ice by the time we left. So we were thinking about getting a cooler full of dry ice, sealing it and not using it till we needed it?? How long does it last?? Does it freeze everything in the cooler you put it in?? Would this be a good idea or not, none of us have had much if any experience with dry ice before!!
Thanx
Marc
Dry Ice is frozen carbon dioxide, a normal part of our earth’s atmosphere. It is the gas that we exhale during breathing and the gas that plants use in photosynthesis. It is also the same gas commonly added to water to make soda water. Dry Ice is particularly useful for freezing, and keeping things frozen because of its very cold temperature: -109.3°F or -78.5°C. Dry Ice is widely used because it is simple to freeze and easy to handle using insulated gloves. Dry Ice changes directly from a solid to a gas -sublimation- in normal atmospheric conditions without going through a wet liquid stage. Therefore it gets the name “dry ice.”
As a general rule, Dry Ice will sublimate at a rate of five to ten pounds every 24 hours in a typical ice chest. This sublimation continues from the time of purchase, therefore, pick up Dry Ice as close to the time needed as possible. Bring an ice chest or some other insulated container to hold the Dry Ice and slow the sublimation rate. Dry Ice sublimates faster than regular ice melts but will extend the life of regular ice.
It is best not to store Dry Ice in your freezer because your freezer’s thermostat will shut off the freezer due to the extreme cold of the Dry Ice! Of course if the freezer is broken, Dry Ice will save all your frozen goods.
Commercial shippers of perishables often use dry ice even for non frozen goods. Dry ice gives more than twice the cooling energy per pound of weight and three times the cooling energy per volume than regular water ice (H2O). It is often mixed with regular ice to save shipping weight and extend the cooling energy of water ice. Sometimes dry ice is made on the spot from liquid CO2. The resulting dry ice snow is packed in the top of a shipping container offering extended cooling without electrical refrigeration equipment and connections.
Not sure how much we had, 4 days into a boundry waters trip we were pulling solid frozen food out of our coolers 
Grocery store get it in and throw it a way check with local grocery and ask I had guys I would save it for 5 dollar tip and you might get a cooler full. Put newspaper around it and put in cooler just dont have cooler where you are sleeping might not be a good thing. Will last for3 to 5 dasy frozen solid. I had meat and ice in cooler and it was still frozen 5 days later. Yes it will freeze anyhting in coller rock hard . Do not use it in cooler for veggies soda beer only frozen things. Will chill a beer down in less than a min but have it opened. Also a plastic soda bottle with small pieces of dry ice and water then recapped and thrown far away will explode with more power than any cherry bomb you ever had but be very careful. And dont let kids do that. 
I’ve used dry ice several times when shipping salmon from Lake Michigan. I shipped via UPS and I’ve also carried it on an airplane. Any time when using dry ice, use a cooler that has a drain. Make sure you leave that drain open because the dry ice will release a gas. And always use gloves when handling this stuff. As stated above, wrap it in newspaper and it should not have direct contact with any of your food because it could freezer burn it.
Thanks for the advice guys!! 
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