You have to store everything, including ice chests, tooth paste, lip balm, toiletries, in addition to the food etc. It's all spelled out for you when you pick up your permit at the visitor center in Lone Pine. The USFS needs to add more bear boxes as there just isn't enough room for all the stuff you have to store. If you're gear is towards the back of the container, you have to take out all the stuff that's in front then put it back. The rangers will issue you a citation if a backpack or ice chest is left inadvertently in your car. I sumitted 9/6 and had gorgeous weather, met lots of people on the trail. Enjoy it and don't lose a lot of sleep over the bears.