There are a few different ways to tie, install or attach a bag on a motorcycle. If the motorcycle bag comes with straps, use them to tie the bag to the metallic construction of the bag frame tightly, if the bag does not come with straps - the most common way is to use bungee cords you can also use a durable climbing rope. If you are using bungee cords, make sure to hook them onto something solid on the motorcycle, such as the frame or a luggage rack. If you are using rope or straps, you will need to tie in a strong constrictor knot securely to the motorcycle.