Cable Matters 10Gbps USB C Multiport Adapter (USB C Hub) with USB-A, USB-C, MicroSD and UHS-II SD Card Reader, 2.5 3.5 Inch SATA Hard Drive and Optical Drive Reader - Thunderbolt 3
Best Buy: Seagate Thunderbolt Adapter STAE129
Thunderbolt 2 external ssd - is there such thing? | MacRumors Forums
Amazon.com: Seagate GoFlex 1TB Ultra-Portable External Hard Drive for Mac in Tuxedo Black with Thunderbolt Adapter STBA1000104 : Electronics