Bears will break into cars to investigate any object that smells or looks like food.
What is Food?
"Food" includes any item with a scent, regardless of packaging. This may include items that you do not consider food, such as canned goods, bottles, drinks, soaps, cosmetics, toiletries, trash, ice chests (even when empty), and unwashed items used for preparing or eating meals. All these items must be stored properly.
How to Store Your Food...
In your car
You may store food inside your car (out of sight, with windows completely closed) only during daylight hours. You may not leave food in a pickup truck bed or strapped to the outside of a vehicle at any time. Do not store food in your car after dark: use a food locker. Remember to clear your car of food wrappers, crumbs in baby seats, and baby wipes. Even canned food and drinks must be removed from your car.
Food lockers are available at Curry Village parking lots and at nearly all trailhead parking areas.