There are three points to consider when carrying loads:
Every motorcycle has a maximum load specified by its manufacturer. It is the difference between empty weight and the maximum allowable weight of the motorcycle and its load, including the operator and passenger. Other things add weight too, such as saddlebags, tank bags, luggage racks, etc.; don’t overload these either. Check the owner’s manual for weight limitations and recommendations for tyre pressure and suspension settings.
Due to the weight and size of a motorcycle, and given it only has two wheels, the position of a load being carried is important. Keep the weight low and as close to the centre of the motorcycle as possible and keep it evenly distributed side to side. Place heavier items in the “load triangle”, the space formed within the top of your head and the two axles. If using a tank bag, make sure it doesn’t interfere with your comfort or ability to steer. Although luggage racks appear to be ideal places to pack things, carrying weight high and to the rear of the motorcycle will lighten the front wheel and may cause a degree of handling instability. Never strap items to the handlebar, front forks, or front guard. Even if the handlebars and suspension travel are unaffected, the extra weight can cause steering instability.
Finally, make sure your cargo is secure, cannot move and nothing can get caught in any moving parts.