RAVPower Dual Charging Cable, $9 with code 9JS5T5QI

It’s going to be years before most of the USB ports in the world use the new USB-C standard, so until then, you’ll need adapters that allow you to use both. That’s what makes this RAVPower cable so great; it’s USB-C on one side, but the other end forks into both USB-C and USB-A connectors, so you can plug into any port you find, no dongles necessary.