Yay! They say:
"For the collection of leaves and other compostable yard debris
BioBag Certified Compostable Lawn & Leaf bags are a full 33 gallon capacity and are perfect for communities who have banned regular plastic bags for the collection of yard waste. BioBags can be composted right along with the yard waste in a municipal compost facility. Lawn & Leaf bags hold more waste, are more durable, and are easier to use than paper yard bags. BioBag Lawn & Leaf Bags made from a resin derived from plants, vegetable oils and compostable polymers. BioBag Leaf bags are Manufactured in the USA with resin sourced from Italy. "