Abstract: A portable shower stall is provided having a ceiling and a base which clamshell together to define a suitcase-like enclosure enclosing all of the support, curtain and hose structure for transport when not in use, and expandable to a full height, fully enclosed shower stall. The shower stall may be installed near any sink or other water outlet, and in the preferred embodiment, water is removed from the base by means of a sump pump which is driven by a water motor powered by incoming water used for the shower head.