Now, I'm sure there are other brands out there, but Choetech were good enough to send over a couple of pairs of USB to Type C adapters, so it's theirs that I'm going to plug here. That they come as pairs is a very good thing because they're tiny and easy to lose - I've already lost one of the four adapters sent over a couple of weeks ago!
While you may have your own uses in mind for these adapters, the main one I have in mind is when trying to use a legacy phone, with its own USB data and charge cable, with a new 2017 laptop that only has USB Type C jacks. The new Apple Macbooks are the first such, but I'm sure others will follow - Chromebooks and, one day, even Windows Surface devices or laptops. Or perhaps the main USB port is occupied and you're having to use a secondary, Type C port?
Either way, you plug the USB cable into the back of this adapter and then the Type C end into the appropriate Type C (or, in Apple parlance, Thunderbolt 3) port - and you're off to the races.
Choetech says of the adapters: "Built-in 56k ohm resistor follow Type C standard specification. Support OTG, hot plug and play design. No external driver needed and without software installation." I've come to trust the Choetech kit and these certainly seem to work.
I also tested the other use mentioned above, that of plugging in standard USB flash disks to a Type C-equipped smartphone, and this also worked immediately (on Windows 10 Mobile, the USB flash disk mounts as just another disk drive on the phone).
The adapters are £6 for a pair on Amazon UK, which seems like decent value - expensive enough to guarantee that corners haven't been cut and yet still easily in impulse buy territory.
A very handy little widget for your briefcase or pocket going forwards then, into this brave new USB Type C world - it'll take up to a decade until the older USB-A really dies out, so you might want to snap up several pairs to tide you over!