Are there any special precautions you take when traveling with film (e.g,. in a car) on a long road trip? I'm thinking about doing some traveling this summer, and I don't want any of the film exposed to excess heat very much (e.g., just in case I have to leave the film in my car while I'm on a trip). Would it be a good idea to leave my film in some kind of ice cooler to maintain the integrity of the film? Thanks for all of your responses!