Turn off the riding mower and locate the grass catcher at the rear of the mower. Detach the grass bin from the grass catcher cover.
Slide the large opening of the leaf bag over the entire grass catcher cover.
Pull the drawstring on the leaf bag to secure it to your riding mower. Tuck the lower flaps of the bag under the cover to reduce air pressure leaks.
Attach the snap hooks to the loops on the top and bottom of the bag near the cover. This will also prevent air pressure leaks that can affect the performance of the blower and bag.
Hold the cleat on the bag with one hand, and firmly pull the drawstring again to tighten the bag. Wrap the drawstring securely around the cleat.