Abstract: A five or six gallon blow molded plastic water bottle has a regular hexagonal cross-section. The bottle is preferably made of polycarbonate and has a wall thickness of between 0.040 and 0.060 inch. An integral protrusion is formed on one face of the bottle and a depression is formed in a second diametrically opposite face of the bottle. Adjacent bottles may be stacked by inserting the protrusion of one bottle into the depression of an adjacent bottle. With the protrusion and depression of adjacent bottles engaged, the adjacent faces of each bottle contact each other so that the weight of the upper bottle which is borne by the lower bottle is distributed across the face. When the protrusion and depression of adjacent bottles are engaged, the top surface of the protrusion does not engage the bottom surface of the depression, so that indica labels or the like attached to the depression are not defaced or damaged.