Because I like to be prepared, I have constructed a detachable key-ring full of small tools that I wear on my belt at all times. My belt loops through it and it passes over the top of my trousers and hangs on the inside. This placement prevents a bulge in my pocket and can easily be accessed. On the key-ring is a ferrocerium striker that can be obtained through a Boy Scout Supplier. In addition, I have a small Swiss Army knife that includes a knife blade, finger nail file, flat blade screw driver, scissors, toothpick, and tweezers. I also have a P38 military can opener, a whistle for signaling, and a micro LED light.These tools have served me well in both wilderness and urban settings, but you may choose a different set based on your needs. What would work best for you?