The Double Becket Bend is One of The Most Important Knots You Can Learn. The Double Becket Bend is one of the most useful and important knots you’ll use in a wide variety of survival or emergency situations. It is considered so essential that the Ashley Book of Knots lists it as number 1. It is easy to learn, and it applies in many situations. Best of all, it has that most important characteristic of all good knots — it is easy to untie.