Thanks for the suggestions! I have a Polar soft cooler and love it but it's too small. Don't want to buy another right now and wouldn't care about leaving my old hard plastic cooler. I was thinking of skipping the dry ice and taking my chances on everything being frozen when I put it in. My local dry ice co. website says not to store it in an air tight container as the released co2 gas can cause it to explode. Long term storage but can't imagine just for travel or I'd think the airlines would have a major problem with that.