We travel late in the year so don't worry about spoilage unless we get a super heat wave.  We have left-over food like pasta pesto stored in a zip lock bag if anyone wants to supplement a meal.  

One note of caution that I heard is that the best way to attract a bear is to burn food.  If its still allowed, I understand bear hunters bait bear that way.  I heard a story from turn of the century Duluth where a ship carrying sugar burned in the harbor and the next day there were ~50 bears in town.

starwatcher