These bags are made from non-GMO corn starch.
Bonnie Bio are recently accredited by Australasian Bioplastics Association for their bin liners to be home compostable (which costs around R100,000 and I am told very rigorous – South Africa does not have its own home compostable certification yet), meaning you can throw them in your home compost bin. They say it takes 3-5 months in a Cape Town bin, because of the amount of sunlight. I haven’t tried, but I am going to!
The company is South African but sadly not made here, is imported from China.