Byrdbyte is currently crowdfunding for its Case X MacBook USB-C hub on Kickstarter. The attachable laptop case has six ports, including microSD and SD card readers, and a 100 W USB-C port. USB-A ports on the device can handle data transfer at speeds up to 10 Gbps, and one model has an SSD interface.
https://www.notebookcheck.net/Case-X-MacBook-six-port-USB-C-hub-launches-via-Kickstarter-with-optional-external-storage.625660.0.html