2 ring-shaped rare-earth magnets [lanyard self-attachment for infinitely-variable length]
ping-pong ball [gooped to ring-shaped rare-earth magnet] -> stand/handle
Carried separately: Anker Power Bank (PowerCore Fusion) or Plugable Dual USB C Charger Block [iPhone + MacBook]
Potential Discovery or Invention
After a couple of years, the ping-pong ball was destroyed when it was dropped to the floor. It is still the lightest-weight option.
Potential Discovery or Invention
Here is the FlipZip Magnetic Quick-release Phone Mount System, which does not have features like MagSafe charger, USB-C cable, adjustable-length lanyard, switchable-orientation stand or variable-viewing angle.