Paola is very proud of the fact that the bags are eco-friendly,  made of a renewable material called Caña Flecha and dyed into distinctive and lustrous hues with only plant extracts. But truth is, Caña Flecha isn’t just eco-friendly.  Caña Flecha is Gynerium sagittatum.  It thrives across big swatches of South America, and where it grows it is the ecology.  It’s a reed, a tall, grass-like palm. Think of it as mondo crabgrass -- Kudzu’s tough, smart-alecky older brother. It’s the perfect raw material.  Cut it and you can almost watch it grow back.  People have been building whole houses out of this stuff for centuries.   At least one international energy company is pouring billions into R&D to turn it into bio-deisel.