If your Trapper doesn't have a clip, that's the problem. I am not familiar with the trapper. I understand the Trapper may be the important item here. But all my carry knives over the last 10 or more years had a clip, so I didn't need a sheath, (although at work I had one, because the knife/clip wore out the corner of pocket in my jeans). I made a nice sheath where the knife clip clipped onto the sheath, instead of my pocket. But most of the time, I just clipped he knife to the pocket.

Okay, just check out the Trapper. Seems Buck, and Case, and who knows who else has a "Trapper" knife. Doesn't seem to have a lock blade. That's a deal breaker for me. You're on your own. I had one blade fold over into my thumb about 40 or more years ago, Never Again.