In assembly of a pressure vessel and mount, the pressure vessel has a diameter and a length and includes a substantially cylindrical body and a boss neck. The substantially cylindrical body has a domed end and tapers from a portion having the diameter to the boss neck at the domed end. The mount includes a central plate and first and second flanges. The central plate has an aperture therethrough configured to accept a portion of the boss neck. The first and second flanges are located at opposed first and second sides of the central plate, respectively, and are configured to extend toward the body. The assembly occupies no more than a rectangular prism space defined by the length, a width equal to the diameter, and a height equal to the diameter of the substantially cylindrical body.