PepsiCo plans to pilot a 100% petroleum-free bottle next year. The polyethylene terephthalate container was developed using a combination of switch grass, pine bark and corn husks. The bottle is part of a race by manufacturers to reduce or eliminate packaging made from petroleum. "There's a lot of pressure," said Ed Glatzer of global consultancy IHS. "Everyone's always followed Pepsi and Coke. Sustainability is the catch word."