We loaded up cooler with frozen fish from fishing trip with last fish caught in zip lock bag with water that we put in bottom of cooler.   Added two 1 gallon frozen bottles to cooler.   Set it in back of pickup under black cover.  Drove home 8 hours,  60 degree weather,  went to sort fish out and the fish and water in zip lock was FROZEN.  Of course everything was still frozen.   Originally bought cooler to bring home shrimp on 48 hour trip which it did great at.   Now if they had a 100 qt one to take out in boat!