4-oz. Whirl-Pak Bags by Nasco

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 - 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° F (82° C). Bags can be frozen to any temperature, even liquid nitrogen - careful handling required after freezing. All bags are sterilized after manufacturing.