MedCovers. bags are made with heavy-duty Imperial (oxford) poly/nylon blend fabric. Features durable D-rings (tested to 11lbs. loads), padded interiors to protect equipment, heavy-duty thread top stitching, pockets to carry extra cannulas, and adjustable straps for convenient carrying. Available in black only.Fits all M6 and M9-sized cylinders and most pneumatic conservers; with an adjustable strap, regulator viewing window and grommet hole for tubing.