I read "camera bag" as "dedicated bag" but, along with Akira, my most often used bag (daily) are work bags, either shoulder or small backpacks. They'd always contain minimal photo gear, i.e. Df, one mounted lens and occasionally a second one. Which lens comes along is according to the mood, or (rarely) purpose. Usually some MF prime, somewhere in the 25mm - 105mm FL range. With two lenses : recently, for a concert shoot, 58/1.4 (Voigt) and 105/1.8 AIS. Otherwise most likely 40/2 (Voigt) + close-up lens, and 105/2.5 AI.