contemplated shapes of the invention preferably fall within the following ranges in accordance with the invention the container is integrally formed from a substantially homogeneous paperboard blank by a press preferably the blank is a unitary flat piece of paperboard stock conventionally produced by a wet laid papermaking process and typically available in the form of a continuous web on a roll the paperboard stock used for the blank preferably has a weight in the range of 100 pounds to 400 pounds per ream 3000 square feet and a thickness or caliper in the range of about 0 008 inch to 0 050 inch paperboard having basis weight and caliper in the lower end of the range may be preferred for ease of forming and economic reasons of course this must be balanced against the lower strength and rigidity obtained with the lighter paperboard no matter what paperboard is selected the containers of the invention have greater rigidity than prior containers formed of comparable paperboard preferably the paperboard of the blank has a density in basis weight per 0 001 inch of caliper in the range of 8 to 12 the paperboard comprising the blank is typically bleached pulp furnish with double clay coating on one side preferably the paperboard stock has a moisture content generally water varying from 4 0 to 12 0 by weight in forming the containers of the invention the best results are achieved when the blank has a water content by weight of 9.