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High Fist Shin, I've found that getting two flats in a day is very unlikely. When it happens, they usually have a common cause such as a wire that should have been removed after the first puncture. To balance my risk and trouble, I carry one spare tube and a patch kit (and of course a pump). If I get a second flat, I'll patch on the road, but I'd rather not. I check my vulcanizing fluid periodically, since an open tube dries up over time. At home, I use a big can of the stuff rather than a tiny squeeze tube, and this way, I avoid opening the tubes.