I could carry a cell phone in my saddlebag,
I could carry a bike pump, some inner tubes, a few patches, perhaps some CO2, and a few tools.
Given that I ride exclusively in the city, I opt for the cell phone. There are taxis everywhere. I'm not a weight weenie -- I would just rather fix a flat in the comfort of my own living room. So what's the flaw in my logic, if any?