The best I have found so far with good specs is the "sandisk SanDisk ultra dual drive go". The spinny thing is super annoying but you can glue it in place if you don't need the type-A. It's a bit bigger than the yubikey, but it's smaller than the other alternatives.
That's the one that I use now! I'm weary of the spinny kind because with other brands/models the outer spinner has ripped off the flash drive, but at least so far I haven't had that issue with the "SanDisk ultra dual drive go". The only modification I've had to do to it so far is lubricating the spinny bit because it was all grindy and rough.
I got the ultra dual drive (non-go), no silly spinny bit, just a sliding mechanism that locks into place in either configuration as well as fully retracted on both sides.
