I love, love, love my paracord collars. I have one for both Rider and Harlow. For everyday collars, they work fantastic and don't break hair on the double coated dog (which I'm anal about). I dabble in leather work, and have thought about trying to make a round braid slip lead out of thin leather strands, but it wouldn't hold up with my guys as I let them out on the long line with their tag collars on.
I've thought about tweaking them a little bit to have two o-rings and a cat collar quick release buckle in the middle so that if they were to get caught playing or anything that they would come off... however, I love the slip so much that I haven't committed.
Harlow: 2010 Fawn Boxer Rider: 2011-ish ACD/BC