Abstract: The present invention relates to a system for coupling cylindrical sections to form an assembly of thermal or similar containers, where coupling to form the assembly is effected by an internally threaded connecting ring, normally carried at the base of an upper section, to the exteriorly threaded upper circumference of a lower section. The sections may be separated from one another internally to define chambers of discrete volume by screwing an exteriorly threaded section-separating into the upper and/or lower end of each cylindrical section.