I bought the bag to use with a Royal Enfield Meteor 350. It fits the tank well. The rear strap can be slotted underneath the tank to secure the bag, and act as a pivot to move the bag during refuelling. The magnets supplied with the bag are strong. You can add extra magnets as well. The bag was put straight to use on a 700 mile trip from South Wales to the Yorkshire Dales and proved to be very secure. The rain cover also worked well during a very wet trip and the bag remained dry. It’s very good value.