Bag opening is 114 inches in circumference. That's six times more capacity than the 6 1/2-bushel bags found on most 2-bag collection systems! How does it work? Set aside your collection system's small bags, slide the Lawn Tractor Leaf Bag over the top of your system's hood, and then tighten the dual drawstrings. Made from durable polyester fabric to withstand wear and tear in your lawn, these bags also allow airflow from your mower to escape. When the bag is full, unattach it and then lift it up to easily dump the leaves out. Material collection system/grass catcher is NOT included with your Lawn Tractor Leaf Bag.