I have the co2 set up and also a frame pump. The reason for the two is that sometimes the co2 cartridge will not work. Sometimes you get a dud. They are expensive so now I buy them in bulk. Great price.

I carry a patch kit plus an extra tube but I will also be adding another tube soon just in case. I do like to have the ability to patch if needed.

But one time I was stupid and left the tube at home so all I could do was patch. It was pouring down rain and these were the self patching patches. THEY SUCK. buy the ones with the glue.