This is an Amber Bone Medium Stockman in a Buckaroo pouch. I've got a few sheaths from RGR. He makes some good products. It's made to slip into your pocket, with an attached strip of leather that goes around your belt. This is especially handy for me at work. I can pull the knife/sheath out of my pocket using the leather strap. Pull the knife out of the pouch, letting the pouch dangle until you've finished using the knife.
He also makes some without the attached leather strap, which I use for a less casual occasion.