Why You Should Carry a Knife From simple pocket knives to Swiss Army-style multi-tools, the choices, sizes, and styles of everyday carry blades are endless. If you’re not keeping a good knife on your body as part of your EDC, you’re skipping one of the basic essentials. To me, having a knife handy is a necessity. I use different knives for different tasks, but having a good all-around knife is an invaluable tool that you’ll use over and over again. If you’re not currently used to carrying a knife on a daily basis, you may be wondering why you’d need one.