Rob, what the park rangers will tell you is 1) don’t leave anything that has any scent in the car (food of course, but also perfume, deodorant, toothpaste, etc.); and 2) don’t leave anything that looks like food or looks like it might contain food in the car.
I’ve left my car in the valley for several day backpacking trips with no issues, but I stripped it down as much as possible. No coolers or fast food containers, cups, cans, bags, etc.
Your luggage would be fine, as long as you have taken care of the rest.
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