Most rental containers are made from durable, weather-resistant steel and feature sturdy cargo doors that can be secured with a heavy-duty padlock. Some may also have additional security features like lockboxes (a steel box that protects the padlock from being tampered with), internal locking systems, or even alarm systems. It's best to inquire with the yellowhead about the available security features. Remember, while these features can provide a good level of security, it's also important to consider the overall security of the location where you'll be placing the container.