These extraction bags are double-stitched with extra-strong nylon thread. Made of very durable and distinct-looking black canvas, as well as a micron screen sidewall which provides more screen surface area. These extraction bags are double-stitched with extra-strong nylon thread. Made of very durable and distinct-looking black canvas, as well as a micron screen sidewall which provides more screen surface area and allows for faster draining Bubble MagicTM Bags are available in 5 gallon and 20 gallon sizes. They have attached handles for easy transport and each set come with their own personal black carrying bag.