I have an igloo and a coleman 5 day extreme cooler. they are great,but you have to either pre-cool them (fill them with ice packs for a few hours/or dump a load of ice in them), or fill them to the brim with already cooled things from the fridge or freezer. When full and with pre-cooled items in them I find that I can use a single bag of ice for multiple days. I use them for FTC occasionally, but they are kind of big. I feel like they dont stay as hot as a smaller cooler with less air space to heat inside. The small igloo/coleman lunch sized hard plastic coolers work even better for FTC.