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So I bought an F tuba yesterday (Rex Martin's custom Rudy) and it only came with a very thin gig bag. I don't really trust myself, so I would like to get a hard case. The problem is I think it would be difficult to manage two tubas in rolling hard cases, so I would prefer something I could wear for my F tuba. Does this product exist? If not, what is my best alternative?

I believe the Accord hard cases have backpack straps.

I expect you could use the same backpack system as the Accord (https://www.fiedler-cases.de/en/fiedler ... y-kit.html" target="_blank) on a reasonably form fitting hard case like a J. Winter.