In Dakar, Senegal, an unofficial international delivery system that’s existed for decades has recently made its way online. It lets people send anything, anywhere in the world but most frequently to the African diaspora in Europe.

Known as "peer-to-peer suitcase sharing" the concept is relatively simple: rent out your extra airline weight allowance to others for a small fee and they'll deliver your package.

Correspondent Emmanuelle Landais in Dakar has been to find out how travelers cash in on the extra space in their suitcases.