So far so good. I ran a test from my front porch. We went on a one day trip, I prepared the cooler with drinks, some frozen ice packs a some ice. When we got home, I left the cooler on the porch. Five days later the drinks were still cool enough to be refreshing. The cooler was in the shade most of the days, uncovered. When I take this little gem to camp, it will be covered. Only thing I didn’t like was the plug. At first I couldn’t get it tight enough and it leaked all over my back seat. So, I used olive oil on the washer and tightened it as much as I could. It’sbetter now and has not leaked. There seems to be some condensation around the plug, probably since it is thinner there to accommodate the plug.