Nalgene polycarbonate straight side wide mouth jar 250ml description this 250ml 8 ounce straight sided jar is constructed of transparent polycarbonate with a white polypropylene pp closure window clear transparency with high impact resistance nontoxic excellent for cold room and refrigerated use note before autoclaving completely remove cap or closure and set on top of the container at an angle without engaging the threads repeated autoclaving will shorten jar life specifica