Headshell mounted cartrige storage/protection

Curious what the best options are for storage/protection of single and multiple bayonet style, headshell mounted cartridges?

I have factory cases/boxes and a Fidelity Research case that holds 2 headshells but looking for something that holds more.
I know there are vintage FR cases that hold up to 5 headshells but how well has the foam and rest of box held up?


Looking for quality, not a cheap plastic 'DJ' case.