I saw a video on you tube about a bear who broke into a car at clingmans dome a few years back. Now, the window was down a little and the food was in a booksack. We will be in a SUV and a Jeep. We do not have any trunks. What should we do with the food while we hike at stations through out the park. I was thinking of putting it in an ice chest. We plan to keep the windows up on the SUV, but the jeep has a soft top. The day we will be in the jeep we will not be in the SUV. Do you think that food in ziplock bags and inside of an ice chest is safe? If not what should I do?