If you use a black powder rifle that fires round lead balls, you need a leather ball bag, to keep your balls in. There are so many bad jokes that can be made about this, I am going to leave that up to you all, and your creative minds.
Back in the 1980's there was a western themed bar and entertainment complex downtown Orlando call Rosie O'Grady's. In the gift shop they sold leather bags made from bulls scrotums. I regret not buying one of those.
What is your best leather ball bag quip?