UPDATED
When traveling with a TS100 portable soldering having to carry a power-adapter for it can be something you don't want. If you're unfortunate enough to be living in dongle-town, then you can at least make the best out of it.
Purchase a USB-C Power Delivery adapter, solder an XT60 to it and 3d print this sleek case for it.
The adapter I bought can be found here and it's the last one, the smallest.
It allows you to select between 5V and 20V by soldering a jumper on the PCB. Mine arrived pre-set at 20V which is perfect for the TS100
Hope you enjoy this accessory

UPDATE April 15 2019:
I've added an alignment jig to print.
It allows you to correctly align the XT60 with the PCB and the shell.
This might make soldering easier :)