It is practical.
It is effective.
Even children can do it!
When carry two, you run out of arms. That might be why Africans carry things on their heads.
And US visitors appear to be quick learners.
It looks complicated! It is hard to explain, but the baby is carried on the back with a baby quilt wrapped around the person carrying the baby and the baby.. The baby is swung up onto your back as you lean forward and this the blanket is wrapped around you and the baby together and tied at the front and tucked in under the baby's bottom. The baby's legs are left out in the open with the feet facing forward and voila!