The Leaf Collection System is an accessory that converts the TriVac into a high capacity leaf collector. Easily mulch and collect 550 gallons of leaves down to a small enough size that allows them to fit into a 55 gallon trash can. That"s an 11:1 mulch ratio. Made of breathable cotton/nylon. Uses nylon rope with quick-loc clasp to attach to trash cans. Includes leaf bag to cover.