I'm always worried my helmet is going to fall off the seat or other less stable perch while I'm getting stuff in/out of my side cases. Yes, I could just leave the helmet on my noggin' until I'm done and in some cases that's what I did do. But we all know that for anything other than riding, it's not exactly enjoyable to keep your helmet on. Especially when it start to get hot. So, where do you hang your helmet after you dismount?