It is a little too loose for me to comfortably carry without worrying about it slipping out. I think, however, that either a restraining strap (which could work well since the curve of the blade catch is exposed) or simply an adjusting screw somewhere near the talon hole would provide enough extra pressure to be more secure.
Heh, I figured if I ever did want to strap it onto my pack, I'd contact you for a new sheath for it. Are the others in this thread yours as well?