guys i have seen cruiser riders with shoulder bags that dangle to one side. you know the type, the 'authentic' look with the black leather bag. dont these flap around at high speed? i normally use a backpack and they are very secure with staps around both shoulders.....but these just dangle to one side. i like the look of them, and want to get one, but if they are gonna distract my riding by flopping around, it may not be a good idea to get one. do any of you have them?