I have finally gone out and purchased my Surly Disc Trucker and have put on the racks. I want to mount a medium sized handlebar bag that will still allow me to use my Garmin bike computer. I think then I need one that has a good mount that pushes the bag forward about an inch or two from the handlebars. I have looked at the Topeak and the Ortlieb on line but both had a significant number of write ups complaining about the mounting system. Am getting ready for my first tour on the bike, so need some help. Thanks