Abstract: A chemical delivery system comprising a collapsible, container, such as a storage bag, positioned within a pressure vessel for providing delivery of a chemical fluid includes an inlet port on the uppermost portion of the storage bag and a withdrawal tube extending from the lowermost portion of the storage bag to its top. The withdrawal tube, which is made of the same material as the storage bag, is routed alongside, or within the storage bag, from the bottom to a point above the top. In one embodiment, the storage bag is carried within an rigid pressure vessel and the withdrawal tube is carried through a wall of the vessel without the use of inline fittings. In an alternate embodiment, the storage bag is secured within a less flexible bag, which provides a pressurizing receptacle.