You can find commercial USB sticks that can also connect via WiFi ... ESP8266 married to a card reader. It all starts with the old trick of soldering a header to an SD card adapter.

Case in point: [q3k] sent in this hack of a tiny WiFi-enabled SD card reader device that he and his compatriots [emeryth] and [informatic] worked out with the help of some early work by [Benjamin ...

eErlik Latest USB Type C, USB 3.0 and Micro USB OTG Memory Card Reader Adapter Portable 1 Slots for TF, SD, Micro SD, SDXC, SDHC, MMC, RS-MMC, Micro SDXC, Micro SDHC, UHS-I, USB 3.0 This is a ...

You can print wirelessly from an SD card. Use an SD card as a boot drive to restore a faulty OS. You might be surprised by how you can re-purpose them. From using them as a portable media storage ...