Now that laptops (including but not limited to macbooks) can charge via USB C I just have one charger that I take for both my phone and laptop. Sometimes I take two cables so I can charge both at once. Sometimes I don't bother.
My problem was that I brought a USB-C to lightning cable to charge my phone off my computer, but I forgot a USB-C brick (and magsafe or USB-C cable) so that my computer had power. Fortunately there were Apple employees at the conference and they let me borrow a charger while we were hanging out at the bar!
