The bottle sling knot has been around for centuries. This ancient method of forming a sling for the neck of a jug or bottle this knot was described in detail by the Greek physician Heraklas in his first century book on surgical knots and slings.
With a little practice you’ll be able to master this interesting, useful knot.
bottle sling knot PDF file
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Some of my favorite knot books -
The Ashley Book of Knots
The Ultimate Encyclopedia of Knots and Ropework: Over 200 Tying Techniques with Step-by-Step Photographs
The Marlinspike Sailor
Encyclopedia of Knots and Fancy Rope Work