An immersion-cooling container for single-phase liquid dielectric immersion cooling. The container has a tank and a liner, which mate together to form a sealed inflow channel and one or more sealed outflow channels. The liner and the support base comprise one or more vents to permit passage of liquid dielectric coolant to envelop and cool equipment disposed inside the container. The tank sidewalls have corrugations that define one or more down-flow channels that promote passage of the liquid coolant from the container and into the outflow channels, thereby enabling continuous circulation of the liquid dielectric coolant.