All bags are sterilized after manufacturing using ethylene oxide gas at an independent iso-certified facility. Exceptionally clear film and superior strength are achieved by using co-extrusion low-density and linear low-density, virgin polyethylene. The white tape closure makes sample identification easier and more convenient. 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 degree F (82 degree C). bags can be frozen to any temperature, even liquid nitrogen. Keep samples safe?easy-seal bags hold solids and liquids quick and easy sealing?flip bag around wire/tape and bend to seal no more poking?puncture-proof tabs keep wire intact even after extensive use.