Stuart has a very large Victorinox Swiss Army Knife (SAK) and was unable to find a high-quality leather sheath / holster for it. He also has many Filson bags and loves their harness leather straps and wanted an upcycled SAK holster from that leather. The largest piece of Filson leather we could find was a dog leash. Four prototypes and lots of hand-sewing later, the Filson / SAK holster was born.