A quick-release hitch built for the moments when your other hand is holding the load: loop, pinch, scoop a bight through with a thumbs-up motion, and it locks tight — pull the tag end and the whole thing falls open.
One extra pass turns a slip knot into a span loop — a fixed loop anywhere along a rope that holds under hard tension, doesn't cinch down on what's inside it, and still unties with a push on the collar.
Two wraps over your thumb, pull the bottom loop through the top one, and you've got a strong fixed end loop — and pulling the two loops apart unties it just as fast.