Degenerate
Contributor
If you want a light tray then you make it from plastic that is used for food containers and it must meet standards for storing food so is also safe for water. You can make ball handles if you want mine handles are just round with screw threads that have standard sizes so can use go pro screws or camera screws. The screws into the handles at the bottom are standard go pro fittings. You can remove everything and unscrew the handles and pack into a laptop case. I put my camera lights extra batteries spare screws chargers and dive computer into a DJI hard case for a Phanton3 drone. It meets hand carry for flights.
I don't think anyone with a larger camera setup with arms would rely on a plastic tray.
Plastic is brittle, and tends to break when stressed.