Well this helps narrowing things down. The large seatpacker, the frame and burrito bag may suffice. When you get the seatpacker, load your bike up with all three bags, pack them as if you are going camping,then take it for a long ride. This is your trial run. Stop at a park set up camp, and see did you miss anything that you had to carry but didn't have any room? This is going to tell you if you need the larger front bag. Don't spend more money than you need to, do a practice run, which is prudent anyways and evaluate your choices.