I have a Pelican 150-qt bought from DVOR $360 delivered I think and love it. I can fit a whole elk in it but it keeps ice all week in 70-80 degrees.
Look around I think Amazon has some deals. Sorry i cant add to the ones you specifically asked about but they are worth the cost and weight. I hate have water only on archery hunts after the 3rd day.
Is the elk a full-size elk? If yes, how many pounds?
