Nice pictures.
What you have there is one of our many South African species of "bagworm".
It is in fact not a worm, which is no surprise when you see how many creatures are called worms.
They can't all be worms after all.
There are many species of insects that make such bags, including the so-called "caddis flies", but the young of caddis flies live underwater.
Clothes moths and their relatives make similar bags, but they are in another family and do not cover their bags with sticks.
What you have there is the larva of a moth in the family Psychidae, the bagworms.
Some of them are pests, such as the wattle bagworm, but most, such as the one that you show, are practically harmless and very interesting, not to say engaging, members of our wild communities.
As soon as possible after leaving the egg, the young bagworm caterpillar, or larva, which still is tiny, far too tiny to drag a big bag like the one that you have illustrated, spins some silk and fastens together bits of plant material to make its first bag. Different species of bagworm make bags of different designs.
I have seen several that make bags looking like yours, but I don't know the species.
Over 100 species are known from South Africa. As it grows, feeds, and changes its skin, the larva enlarges its case as necessary. I think the one that you have illustrated must be nearly fully grown.
Some species are parthenogenic, laying eggs without any males, and I have no idea whether yours is one such.
I do not think it is likely, because most species do have males.
When it is fully grown, the larva shuts up shop, sheds its skin yet again, and becomes a pupa.
So far, so standard, but after that the pattern changes, depending on the gender of the larva.
Male moths are generally rather shabby looking, ordinary moths.
Like some moths and unlike others, they do not waste time on feeding, in fact they cannot feed; they have just a day or two in which to find a female and mate.
They do that at most once. Then they die.
The female is a totally different bag, and hardly more than that, unkind though it sounds; she has no wings to speak of, and not much in the way of legs, only enough to turn one way for mating, and afterwards the other way for laying her eggs inside her bag. Then she dies too.
I seem to have heard something similarly funereal somewhere else; where might that have been? Romeo and Juliet, perhaps?
The more cheerful aspect is that before she dies, she lays a couple of hundred eggs.
When the young hatch, they start the whole cycle all over again.
Laying so many eggs, and staying out of trouble in those bags, you might expect that the bagworms would have taken over the planet by now, but actually in spite of their best efforts, most bagworms never survive to mate.
The wattle bagworm is the only one that I can think of offhand that is successful enough to be a serious pest.
They have various enemies, parasitoid wasps and flies, bacteria and fungi and viruses, and possibly even the occasional shrew or bird that has cracked their camouflage and their shelter.
Also, what with the female laying all her eggs in one bag, and not doing her bit to seek out a male, and with males not generally living more than a day or two, mating is a chancy business.
Probably that is one of the reasons why some of the successful species are in fact parthenogenic.
Cheers,
Jon
A few species are even parteneogenetic which means males are not required for mating and offspring are virtually clones of the parent. The males generally have a very short lifespan and lack mouthparts so their sole purpose is to search for females which they do mostly at night.
Interesting species- another new one for me 
