Page 96 - Patrick Moreau-Marine "Knots How to Tie 40 Essential Knots"

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6 - The knot is finished.
The neck of the bottle can rest in the space formed by the hexagon, which, with traction, will act like a
vice and hold it without any worry that it will slide out.
Then you simply need to pass one of the two ends through the large bight and tie a bend knot with the
other end.
This way, it will automatically adjust to suspend the bottle in complete safety.