Bubble Magic extraction bags are extremely durable, and are built with distinctive black canvas for both strength and good looks. All seams are double-stitched with extra strong nylon thread, and each bag including an extra level of micron screen along the lower layer. Bubble Magic extraction bags are extremely durable, and are built with distinctive black canvas for both strength and good looks. All seams are double-stitched with extra strong nylon thread, and each bag includes an extra level of micron screen along the lower layer. Each set includes a separate black carrying bag.