Abstract: A completely self-contained portable refrigeration unit for maintaining cans or bottles containing food products (e.g., beer, soft drinks, fruit juices, etc.) at a predetermined substantially constant temperature (e.g., 35.degree. to 50.degree.F.) for a relatively long period of time (10 to 24 hours or more). The unit includes an outer insulating case or container and an internal refrigeration cartridge having a plurality of curved surfaces adapted to contact the surface of the products (e.g., sides or ends). The cartridge is filled with a refrigerant substance (e.g., gel refrigerant with predetermined eutectic point) capable of maintaining the curved surfaces of the cartridge at substantially the desired refrigerating temperature for the desired period of time.