I'm usually not that far away from my car, whether at work, running errands or on a weekend "near vacation". Should a photo opportunity arise, I like to keep at least one complete camera kit in my car. Cameras and lenses are pretty hardy, but film isn't robust to the temperature swings in an automobile. It seems that it should be reasonable to place film in a small cooler, and leave it for longer periods of time inthe trunk (boot). In theory this should reduce the temperature swings that the film is exposed to. Does anyone do this? I thought I might take a recording thermometer and see what the maximum temperature fluctuations are in my trunk over a couple of weeks of normal temperatures. Any suggestions?