Green Thumb, Leaf & Lawn Tri-Fold Chute, Strong, Easy To Use, Made From A Single Sheet Of Corrugated, Moisture Resistant, High Density Plastic, Stays Open In The Bag, Unique Tri-Fold Design Keeps The Unit From Folding In On Itself, For Use With 30 Gallon Paper Bags, Reinforces The Sides Of A Yard Waste Bag For Easy Filling, Allows The User To Fill A Bag With Up To 20% More Yard Waste Debris.