Biodegradable Paper Cups by Envirosip. Cups made from sustainably sourced paper with a starch lining. 100% biodegradable and compostable in compost heaps, composting schemes, and landfills. 100% made from plants and completely oil-based plastic free.Yes these cups are green, but that doesn't mean they aren't solid. The sturdy, single wall helps prevent crushing or breaking as you enjoy your refreshing cold drink. They fit in our cup dispensers too. Recommended for cold drinks only.