Ouch!!
I carry a knife on my pfd and cant count how many times it has helped me. From safety issues to landing a fish with tangled lines.
I carry this one. Its only $15. I probably got it for $9 during a sale but its a good deal either way. I use it every outing and it has minimal rust.
www.amazon.com/gp/aw/d/B004ZAIXSC