Personally I dislike using sugar free and related stuff to satisfy an urge to snack, because it goes after the symptoms instead of the cause. The cause is perhaps peckishness or bad habits or whatever, by indulging in diet coke or the like, you gain no extra control. Or maybe I'm just spouting hot air right now.

The pickle idea sounds good. But I have just recently read that smoked and pickled stuff is really bad for you. I'll stick to my dry muesli for now.

Another thing I found helped is to drink a glass of chocolate milk immediately after the ride, it seems to help curb later food passions.