I have a silly question about saddlebags. I've noticed that some of them are hooked together and some aren't. I saw some saddleman brand bags I liked and it looks like they zip together. So how do you mount them? You can't really just throw them over the seat if you have a passenger can you? I assume you still need the metal thing on the sides to keep them out of the rear wheel. These saddleman bags were like $150 bucks vs the suzuki oem ones that mounted to the side and were like 300-500 bucks. Help out an ignorant newbie here!