Abstract: A container has a top and a bottom endcap, a bottle sandwiched therebetween, and one or more bands coupling the top and bottom endcaps and the bottle. The bottle receives therein a flexible bladder. At least one of the top and bottom endcaps has a pair of opposing parallel surfaces, one of which has a protrusion extending therefrom and the other one of which has a recess therein at a location corresponding to that of the protrusion. A valving structure demountably engages with a neck portion of the bottle and has (i) a coupling valve assembly having two channels in fluid communication with the bottle and the bladder for injecting gas thereinto and dispensing liquid therefrom, respectively, and (ii) a twist-lock casing receiving therein the coupling valve assembly and removably coupled to the bottle's neck portion. The twist-lock casing has a structure for safely depressurizing the bottle.

Abstract: A fluid container system comprises a bottle having bellows and being moveable from an extended position to dispense the fluid to a compressed position with a smaller internal volume than when in the extended position. The fluid container may also include a bladder housed within the bottle for storing the fluid; a valve demountably engageable to the bottle and the bladder, and the valve is capable of being closed to prevent the flow of the fluid and gas, or opened to dispense the fluid and gas. The fluid container may also comprise top and bottom endplates that support the bottle.