Abstract: The cap includes a body constructed of a flexible and resilient material having a substantially square shaped top, a substantially rectangular shaped front, and substantially rectangular shaped first and second sides which are interconnected along with the top and front in a substantially “U” shaped configuration. The body further defines an open interior extending between the sides and from the front to a rear interconnecting edge defined along the top and sides. The corner cap is releasably engageable over the severed corner of the container in resistively affixing fashion. To this end, the resilient and deflectable first and second sides are being angled in inwardly extending fashion, typically between 5° to 10° relative to a vertical axis extending through each of the sides and so that, upon affixing the body over the severed corner of the container, the sides biasingly squeeze against the corresponding sides of the container.