Once you have fitted the roof bars and box, it will need to be securely attached and locked in place. Most rooftop carriers come with adjustable straps which can be used to fasten the box onto the roof bars, and some also include a locking mechanism for added security. It is important to ensure that these are tightened correctly as they hold any cargo in place, and check every now and then to make sure they remain secure during your journey. Finally, always follow the manufacturer’s instructions for fitting and using the rooftop carrier as this will ensure you are using it safely and correctly.