A combination of the 6" fish fillet knife and small 3 1/4" utility Puukko in a double sheath. This one makes a lot of sense to me. I can see the need for both a utility knife and a fillet knife for a wilderness fisherman. The filet knife is stainless and the puukko is carbon. The simple birch handles and sensibly sized blades keep the weight down to about 6 ounces including the sheath. It's not burdensome on the belt.