a container for receiving frangible items comprises a sheet of polymer formed into a base portion having a plurality of item - receiving cavities for supporting frangible items . a cover portion has an item - covering concavity for covering the frangible items . a first hinge portion is positioned between a first longitudinal edge of the base portion and the cover portion for rotating the cover portion onto the base portion to hold the frangible items captive in the item - receiving cavities . the first hinge portion comprises a pair of longitudinal grooves formed into the first hinge portion and extending parallel to the first longitudinal edge of the base portion , with a web defined between the longitudinal grooves , and a hinge - reinforcement wall at at least one end of the longitudinal grooves . a fold line is formed in the web and in the hinge - reinforcement wall when the cover portion is rotated onto the base portion .