Also available as a pack of 10, SKU - BG-CS-55-P. World Centric compostable bags are made from a mixture of synthetic and starch based plastics. These bags are great for kitchen compost and to bag up yard waste like leaves and lawn clippings. These bags have an expected shelf life of 12 months and should be stored away from heat sources, direct sunlight, and moisture. A commercial composting facility may not exist in your area. They are also certified for home composting.