I was really excited to review this. I received this product in exchange for my honest review. To test the effectiveness of this cooler, I did an experiment. I put ice into the cooler (the recommended amount) at 5:30 pm and then checked the results at 10:30 am. I also added 16 tonic waters and 6 beer bottles. Throughout the 17 hours, the cooler had a loss of only 22% by weight of the ice. That means 78% retention of the ice. That being said, I was very impressed with how well this cooler keeps drinks cold. It also has a drawer for products you want to keep dry like maybe a sandwich or apples. It’s heavy as you can imagine but extremely efficient. I would recommend this to anyone who wants a high quality cooler that does not lose its temperature and retains its ice. Go buy!