As road bike is worst fitted to carry something with you, I've been searching for the best way to carry essential items like tubes, basic tools, pomp, map and so on. Various types of bike bags like handle bag, saddle bag, back pack and etc. Some of you may carry them in your jersey pockets. In terms of minimizing air friction, too muck balky bags are not likely to be used. Nor weighty containers are not popular among bikers. I haven't reached best solution for this purpose. What is your best idea?