Stackable container with protrusion and groove

A container comprising:

• a top wall, a bottom wall, and at least one peripheral side wall spanning therebetween in substantially upstanding condition, the top and bottom and at least one peripheral side walls collectively defining an interior volume of the container;
• the top wall and the at least one peripheral side wall being unitary;
• the top wall and the at least one peripheral side wall having substantially uniform wall thickness;
• the bottom wall defining a horizontal plane so as to be adapted for resting on a support surface;
• an opening defined in one of the top wall, the bottom wall and the at least one peripheral side wall for accessing the interior volume of the container;
• a protrusion carried on one of the top wall and the bottom wall with a tip spaced from an outer surface of said one of the top wall and the bottom wall and opposite sides of the protrusion depending from the tip on either side thereof towards the outer surface of said one of the top wall and the bottom wall;
• a groove carried on the other one of the top wall and the bottom wall with a base recessed from an outer surface of said other one of the top wall and the bottom wall and opposite sides of the groove extending from the base on either side thereof towards the outer surface of said other one of the top wall and the bottom wall;
• a respective one of the protrusion and the groove which is carried on the bottom wall following a closed annular path about the bottom wall;
• a respective one of the protrusion and the groove which is carried on the top wall following a closed annular path about the top wall and being spaced inwardly from where the top wall transitions to the at least one peripheral side wall;
• the top wall having opposite inclined portions located on an outer side of the respective one of the protrusion and the groove that is carried on the top wall so as to be located intermediate the respective one of the protrusion and the groove that is carried on the top wall and where the top wall transitions to the at least peripheral side wall;
• each one of the opposite inclined portions of the top wall depending downwardly and outwardly from the respective one of the protrusion and the groove that is carried on the top wall to where the top wall transitions to the at least one peripheral side wall;
• the groove of a first one of a plurality of the container being arranged for matingly receiving the protrusion of a second one of the plurality of the container such that the first one and the second one of the plurality of the container are interconnectable in a vertically stacked configuration;
• and
• in the vertically stacked configuration, the plane defined by the bottom wall for resting on the support surface being spaced from the inclined portions of the top wall thereunder.