Took the cooler on a 10 day trip. Pre-chilled and filled with ice when we left. Once we arrived topped the ice off. Cooler was in 95+ degree temperatures every day. Ice completely melted by about the 7th day. Items and water in cooler remained chilly for remainder of trip without adding more ice. Couldn't say more about how well it kept things cool. Keep in mind, read the cooler dimensions as I have a tonneau cover on my full size truck bed and the cooler comes to the top of the bed. Also, when loaded it is super heavy.