I'm going to assume you mean me? I put a bag with stuff in it in my pocket not a saddle bag. The main reasons being so I can leave my bike locked to my roof rack without having to worry about someone stealing my saddlebag or its contents and I can quickly switch bikes without moving the saddlebag (or duplicating bags on each bike). ...but, hey, I guess you can just ridicule without any reasoning if it makes you feel better for being the smarter guy for strapping all your crap to your seatpost.