I cannot think of a time I had to change flints when hunting,and only a time or two on a trail walk, and these were anticipated as I was working on a well used flint when the trail started.I would be comfortable with one spare when hunting, none if I was using one of my spauls which had more than one usable edge. I suspect we all carry more of many things trhan we need, I have noticed the list of "gotta haves" growing smaller over the years.