I created this model for my Travelpro Platinum Elite 21″ Expandable Spinner. It comes with a USB-A port on it that can be connected to a battery held in the suitcase to make it easy to charge right from the suitcase, but I was disappointed that it's just USB-A. I created this adapter to bridge the gap. The large outer holes attach to the same mounting holes already on the suitcase for the USB-A port, and the inner holes allow you to screw in a USB-C panel mount adapter. I bought and made the model for this USB-C connector specifically but they honestly all look very similar so others may work.

The USB silicon dust cover that comes with the suitcase still fits with this model and the round part that holds it in the back can be tucked behind the 3D printed part so that it won't come out.

If other Travelpro suitcases have USB-A ports with the same mounting then this can likely also be used on those.

I am not at all experienced with modeling so I just used Tinkercad for this.