What do you do with your camp cooler?

Unless we spend $200+ on a bear proof cooler, I can't seem to find any that lock or that even just clips shut. All the coolers I've seen just close snugly and could easily be opened by a raccoon or bear (we do camp in areas where there are bears, although they're rarely seen). We usually keep the cooler in the car, but then the ice doesn't last too long this way. Outside in the shade would be ideal but then there's the critters. What does everyone else do when camping? I can only think of bungee cord?

Picture: Our current cooler.