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Constrictor Knot

The constrictor is extremely useful when the need for a very tight binding knot arises, (tying up loose material like trigs or tying up bags.) because any pull that is applied to the free ends is then locked under its own tension. But because this knot can be tightened so well, it is often nearly impossible to untie. (Consider the slipped constrictor knot)
 
Start by making a complete round turn around the object.

Cross the working end over in a second round turn, on the opposite side from the first.

Bring the working end to the front of the knot.

Feed the working end beneath both loops between the object and the line.

By pulling the two ends, this knot will become very tight, binding the object.