Abstract: The widemouthed barrel (1) of a thermoplastic synthetic resin, developed with the objective of minimum space requirement during empty transport and maximum shipping safety, has a conical sidewall section (2) making it possible to stack several barrels one inside the other, as well as a reinforcing and load-securing ring (11), arranged below the barrel border (3), and a base ring (14). In the extrusion blow-molding process for producing the widemouthed barrel, a closed double-barrel body is blow-molded with two conical sidewall sections (2), two barrel borders (10), and a central ring. After removal of the double-barrel body from the mold, this body is separated into two barrels (1) by cutting out the central ring, and the central ring is shrunk onto a cooled barrel (1) as the load-securing ring (11).