I used zipties to attach a brass clip to each end end of the sheath of my dive knife. I then use the two clips to attach it horizontally between two of the D-rings on my BC across my chest. Just like my chest strap only looser. It is easy to reach. It is easy to see so you can put the knife back in the sheath without stabbing yourself. I have tried several different mounting points but this is by far the best I've found.