I ordered one of the "AmazonBasics Carrying Case for GoPro - Large" for storing my generic action camera and accessories. It worked, but the foam seemed to take up too much space and I felt like I could do better. So I printed up these trays to replace the foam insert.

I had to break it up into 2 trays since the width of the case is larger than my print bed. I've included the sketchup file in case you want to modify this for your own needs.