Capacity is measured in fluid ounces when the bag is closed and tab is folded over three times. Volume and dimensions are approximate; bags should not be used at temperatures above 180 degrees F (82 degrees C). Bags can be frozen to any temperature, even liquid nitrogen - careful handling required after freezing. All bags are sterilized after manufacturing. 4 oz. (118 ml) capacity. 3" W x 7-1/4" L (7.5 x 18.5 cm). 2.25 mil (.057 mm) thick. Box of 500.