I was annoyed by not having an integrated storage solution for the dongle when I take my Logitech G703 on trips.
So I devised this cute little spider that comfortably sits in the powerplay/weight coin slot on the underside of the mouse and keeps your dongle safe.
Due to an alignment notch and the genereally tight tolerances, the spider and the dongle have to be placed in a specific orientation. The correct orientation will be obvious but the universe demands that you plug the USB-dongle in the wrong way first.
If properly aligned, the mouse can even be used while the dongle is in storage. I don't know why anyone would do that, but you could actually also fit a tiny USB key in there.
The author marked this model as their own original creation.