Twisting two-ply cord (reverse wrap) – practise with jute or sisal

Each strand is twisted in one direction, for example clockwise. This creates a tension in it that wants to turn it back. If you now lay the two strands around each other in the opposite direction, these two tensions work against each other. One strand cannot untwist without taking the other with it – and vice versa. The result is a cord that stabilises itself.

Bought laid rope is built on exactly this principle: fibres are twisted into yarns, yarns into strands and strands into rope, and each stage runs opposite to the one before. Once you have twisted cord yourself, you understand why a rope end unravels if it is not secured. The counter-tension is no longer balanced there.

Friction between the fibres holds everything together. Long, even fibres grip each other better than short broken bits. That is why unravelled jute or sisal is so good for practising: the fibres are long, even and cheap to get.

The most common mistake is laying both strands in the same direction in which they were twisted. Then the cord immediately untwists again. Remember: twist one way, lay over the other way. At the start it helps to say it out loud: “twist – lay over – twist – lay over”.

Divide the fibre bundle unevenly at the start, so that one strand is a little longer. When a strand gets thin, lay in new fibres with an overlap. Because the strands are of different lengths, the joins later lie staggered rather than side by side. Two joins at the same point would be a weak spot where the cord breaks easily.

Twist evenly and rather firmly. Loosely twisted cord is soft, but it frays and holds little. Make sure both strands stay roughly the same thickness, and the cord will be round and even. Secure the end with a simple overhand knot or a whipping, that is a binding of thin thread.

Home-made cord has an unknown and usually low strength. Depending on the fibre, the twist and the joins, it can be much weaker at one point than at another, and you cannot see that from outside. That is why it is never used for people, climbing, belaying or loads above people. Tested ropes with manufacturer data exist for that.

This entry deliberately practises the technique with bought material. Identifying wild plants and getting fibres from them requires reliable expert knowledge, and harvesting plants is regulated or forbidden in many places. With jute, sisal or even strips of fabric and plastic bags you learn the movement just as well – without that risk.

Take about half a metre of jute or sisal twine and unravel it until you have a loose bundle of fibres. Do not fold it exactly in the middle but a little off-centre, and hold the fold between thumb and index finger. Twist the strand furthest from you a few times in one direction and then lay it over the other one against the direction of twist. Now the other strand is on top – and everything starts again.

The first usable 50 centimetres take roughly half an hour; after that it gets faster. Many people find a calm rhythm, almost like knitting. The technique suits children well because it needs no tools; scissors are enough to trim the fibres. Nice first projects are a bracelet, a pendant or a cord for bundling tinder.

Two-ply cord made on this principle is a very old technique, known in many cultures around the world. Long before there were factories, threads, nets and ties were made this way. Bushcraft textbooks describe it with various natural fibres.

The real value of this exercise lies in understanding. If you know how cord is built, you are more likely to notice when a rope is worn, why ends must be secured and why knots weaken a rope. The same technique also works with fabric scraps or plastic strips when no ready-made cord is at hand – for light tasks.