The Compost Sak is a porous, fabric composting container that makes composting easy and affordable. Turns leaves, yard trimmings, and kitchen scraps into a 100% rich, organic soil improving amendment. The Compost Sak™ is big. The actual volume is approximately 117 gallons, but you will not want to fill it up all the way. We say the volume is over 100 gallons. Most people empty the Compost Sak™ when it is over half full and re-use the Sak.