The Klick Fix bag attachment on the Ortlieb bar bag is good as it's solid yet very quick and easy to detach. However the mount that comes with the Ortlieb uses 2 cables to mount to the handlebars and it's a real pain. So I replaced it with a mount which clamps around the handlebars and just uses a single cable to prevent vertical motion. Again I don't need to use a rack. I keep all things in it that I need to hand and that would be a real pain to have stolen. When I stop I take the bar bag off and get out my lock and lock up the bike. Then I put the shoulder strap on the bag and I'm all set. If my bike or saddlebag are stolen at least I'll have phone, wallet, passport and a jacket and hat and so I can keep warm and call and spend my way out of trouble.