Cartridges for maintaining objects at a desired temperature for extended periods of time can be constructed by sealing a thermoconductive cover on a flexible base container filled with a phase change material with a phase change temperature identical to the desired temperature.

A serving container and ring element system that includes a serving dish and a ring element having a ring element lip with a shape that substantially corresponds to a shape of a serving dish lip, wherein portions of the ring element lip are formed to be positionable around at least a portion of the serving dish lip to provide frictional engagement between portions of said ring element lip and at least a portion of said serving dish lip, such that said ring element is capable of securing a foil pan within said serving dish.

A food serving device including a main body configured to receive and serve food thereon. The main body includes an internal compartment configured to receive a temperature control element therein. The food serving device also includes a panel selectively engageable with the main body and movable between a closed position and an open position. When the panel is in the closed position, the panel closes the compartment and forms a contiguous enclosure with the main body such that the temperature control element is enclosed within the compartment. When the panel is in the open position, the panel exposes the compartment such that the temperature control element can be removed from the compartment.

A holder houses a container of a fluid to be conveyed. The holder has a holder body having a bottom wall and a first side wall extending upward from a peripheral edge of the bottom wall, and a lid body having a top surface and a second side wall extending downward from a peripheral edge of the top surface. The lid body opens and closes an upper opening defined by an upper end of the first side wall. In a state where the container is housed in the holder, the upper end of the first side wall and a lower end of the second side wall are positioned below an upper end of the container, the top surface or the second side wall is in contact with the container or has a gap with the container such that the container is suppressed to tilt at a particular angle or more.