Originally Posted by
andr0id
Another tube and a 2nd CO2 cartridge.
After the 1st flat, 1 is none and 2 is one.
Jersey pockets are for my wallet, phone, money and 9mm adjustment tool.
I did fail to mention that I keep a patch kit in there as well. Not that it does any good sitting in the kit with a single cartridge, but on longer rides, I will grab my mini pump and throw that in the jersey pocket as well. I run tubeless sealant in the tubes of one bike and the other bike is set up tubeless, so flats are extremely rare. In general, they were always rare even before I went tubeless.
And I'm pretty sure you're not talking about a multi-tool, but since others mentioned it, I gave up carrying a multi tool a long time ago. I did so religiously for a long time and then realized that I'm anal enough about my bikes that they always get attention the second something is amiss, usually right after the ride I first notice it on. Of course, having said that I'm bound to have a major mechanical malfunction in the next month.