I spent many hours looking for a perfect case for my DJI Mini 3 Pro and couldn't find one that would also fit the DJI RC Pro/DJI RC/RC N1/Goggles 2/Integra/DJI RC Motion 2 and accessories. In the end, I decided on this case, which is designed for the DJI Mavic 3 Pro/Mavic 3 Classic/DJI Mavic 3/Cine/Combo and simply designed an insert so that my Mini 3 Pro is safely stowed away and doesn't fly around and I have 3 batteries and several SD cards quickly available at the same time.
https://www.amazon.de/gp/product/B0C6F1FD9D/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
It may also fit other DJI Mavic 3 Pro/Mavic 3 Classic/DJI Mavic 3/Cine/Combo cases but I didn't test it for that.
The 3 battery slots are from 3d scanned batteries and therefore snug perfectly into place and even get locked in place until you release the lock which also holds the battery in the mavic 3 pro in place. I, personally, printed it out of TPU to also serve as a bumper.
The author marked this model as their own original creation.