There are at least four sporrans in that are claimed to have belonged to Rob Roy. While I doubt that he was really the owner of so many, they are all from about the right era and they all have metal cantles:
- the one in Edinburgh
- one in Abbotsford house
- another in Inverary castle
- and one sold at Bonhams in 2004
http://www.bonhams.com/auctions/10914/lot/370/