A 15cm extension cable for a microSD card.
Insert your microSD card into one end and then connect the other end to your Pi / PC / anything with a microSD socket and voila, you're connected!
⚠ Note this cable may not be compatible with Raspberry Pi 4, due to the Pi 4's funky fast low power SD access mode. Some hackerly folks have had success modifying the cable by removing a resistor.