[perilunar]

I think it would be practical with glass fibre. Two wires/rings for power, and fibre for data. Something like a Mini-TOSLINK, but even smaller. Ideally the plug would be barely thicker than the cable.

[echoangle]

Glass fibre is pretty fragile though, it would probably break in the first hour for most people if used like a normal USB Cable.

[perilunar]

Just use polymer fibre for consumer gear. Cheaper and more robust.

[echoangle]

Can that still transfer data at full speed with reasonable cable length while bent?