Monster Leaf Bag Adapter Kit Turns Lawn Tractors, Without Grass Catchers, Into Leaf Vacuum Collection Systems The Adapter Kit with the Monster Leaf Bag tranforms your lawn tractor into a monster size vacuum cleaner for your lawn. The lowest cost solution for rider mowers & garden tractors without a grass catcher. Super fast lawn cleanup, up to 30 cu. ft. per load. Unlike other bulky Vac. Collection Systems, you don't need large storage area. Clear your lawn in a fraction of the time, for a fraction of the effort and a fraction of the cost.