Formula help: Concat multiple fields -- even when a field in blank

Hello,
Thanks for your help, here is a screenshot of the connected gear fields:

And the screenshot of the formula field:

As you can see, I can’t find a way that the formula field list simply each item from the camera + lens + battery fields separatly, without repeatition.

I would love having it look just like this for the first line:

So I hope that if I get it this way I will be able to creat a rollup to this field only to checkmarck if the gear is out or not.

Thanks !