Stackable plastic container

A stackable plastic container for holding contents, the container comprising:

• a base portion configured to support the container on a surface, the base portion including an upwardly-extending central base portion and a base reinforcement formation,
• a sidewall portion extending upwardly from the base portion, the sidewall portion including a sidewall reinforcement formation;
• an upper portion extending upwardly from the sidewall portion, the upper portion including a shoulder portion, an angled portion, and a neck portion with a dispensing opening, the neck portion and dispensing opening being substantially centered on the upper portion of the container;
• wherein the base portion is configured to withstand hydrostatic pressure;
• the shoulder portion includes a rounded portion and a flex portion;
• the flex portion is disposed between the rounded portion and the angled portion, includes a segment that extends downwardly from the rounded shoulder in the absence of a top load force, and is configured to flex downwardly substantially radially uniformly around and about a central axis of the container that extends through the dispensing opening in response to a top load force applied to the container;
• the central base portion is configured to receive an upper portion of another container;
• the vertical height of the neck portion of the upper portion of the container is greater than the vertical height of the central base portion configured to receive an upper portion of another container;
• in a stacked configuration, the top load force applied by the container on a neck of the another container forces the neck of the another container downwardly such that the flex portion of the another container flexes downwardly to accommodate an interference caused by the vertical height of the neck portion of the another container being greater than the vertical height of the central base portion of the container, and the total height of the stacked containers is less than twice the height of the unstacked container.