Well, I am 6ft, 250 ( I could lose a few pounds, but my wife is a really good cook ), and it doesnt bother me at all. I find that since the sheath rides pretty tight to my side, there is less chance of it digging into it. I think a loose sheath that flops around would tend to get caught and maybe push into into your side, I am not 100% sure as I dont have a mountaineer I. I am just going by what I think and know of the shadow III. If you look on ebay, you can get a shadow III cheaper as well, there was several this past week that went for less that $205 if funds are tight.