Published more than 10 years ago in climbing publications, the Beer Knot is used to join 2 pieces or ends of tubular webbing together to make a sling or runner. While the customary Ring Bend (Water Knot) tests at 50-65% of strength (depending on which reference you read), the Beer Knot is consistently at 80% as tested by PMI. The Beer Knot is left tied, not removed as others are. It is useful for anchors or other uses when you don't need to re-tie to adjust for length. Easily tied on new webbing, it is a bit of a challenge with used webbing.