By Linda Pressly for BBC. A remote valley east of the Peruvian highlands is the perfect place for growing coca.
Peru now produces more cocaine than any other country, and this is where more than half of it originates. But there is no easy way to smuggle it out, so traffickers hire young men to carry it on foot.
They are the mochileros – the backpackers.
At any moment there are likely to be hundreds trudging over mountains and through the rainforest with pure cocaine worth thousands of dollars on their backs.
It’s one of the most perilous jobs in the cocaine industry.