Datlas,

I too recommend you take a look at the Topeak Aero Wedge at amazon. I have a medium and can fit a patch kit, two tubes, a quickex pro pump, a multi tool, a pair of tire levers, two latex gloves and the car keys. The seat tube connector doesn't really rub that much nor the wedge shaped bag. It comes in a strapped version and a clip between the saddle rails version. I have the strapped version and IIRC it was $15 on amazon.