An elongated post includes a sleeve and an extension, the extension slidably retained within the sleeve. A handle is disposed at a free end of the extension. The sleeve has a first end near the handle and a second end opposite the first end. A pair of cylinder rests is provided, one each of the rests positioned on each of two opposite sides of the sleeve at the second end of the sleeve. The cylinder rests are foldable against the sleeve. A pair of cylinder straps is disposed on each side of the sleeve. Each pair of cylinder straps is adapted for holding a cylinder to the post, such that a distal end of the cylinder rests against one of the cylinder rests. The cylinder straps are foldable against the sleeve. A pair of shoulder straps is attached to the post for wearing the post on a human back. A pair of wheels is disposed at the second end of the sleeve. The post is inscribed with indicia indicating an empty cylinder near the first end of the sleeve, and indicia indicating a filled cylinder near the second end of the sleeve. A person can place the cylinder within the cylinder with a neck of the cylinder disposed near the first end or the second end of the sleeve, to indicate whether the cylinder is empty or filled.