Bubble Magic 20 Gallon Extraction Bags (4 and 8 Bag Sets)Bubble Magic Extraction Bags are made of extremely durable and distinct looking waterproof black vinyl. Unlike other canvas bags, there is no addition water proof material to wear off after time. Each seam is double stitched with extra strong nylon thread. These bags have a unique mesh screen sidewall which provides more screen surface area and allows for faster draining. They have attached handles for easy transport and each set comes with its own