With respect for the gentle and competent Marko, I question the practice of carrying a knife around the neck. Securely sheathed, it may not pose much of a cutting threat to the carrier, but, then again, it might.
The paracord necklace bothers me more. My philosophy of life holds that anything around a guy's neck should have the breaking strength of a Girl Scout handicraft project, say, a string of beads on three-pound mono. Why wear a garrote, handy to the bad guy and to any random snag when you go off balance?
Nevertheless, he has worked out the risks and rewards to his own satisfaction. If he's content, I'm content. Not so one of his commenters.
I suggest you drop by Marko's place to see what I mean. The guy wonders what the knife is +for+ and then answers his own question by speculating the most likely use is crazed and bloody revenge on some innocent nun who fails to step aside for you on the sidewalk. I am amazed at the tolerance Marko shows for the person.