To prevent leaks and messes, follow these tips: Ensure the cooler's drain plug is tightly closed to prevent water from leaking out as the ice melts. Use ice packs or block ice instead of loose ice to reduce the amount of meltwater. Pack food and beverages in airtight containers or sealed plastic bags to contain spills and prevent cross-contamination. Secure the cooler in your vehicle with tie-down straps or bungee cords to prevent it from tipping over during transport.