These foil moisture barrier bags are ideal for preventing corrosion or other moisture based damage during shipping or storage. These are flat bags, open on one end, and designed to be sealed with an industrial heat sealer and they meet all the requirements for MIL-DTL-117 TI CE S1. Made from Protect 470 barrier material, these bags also offer superior puncture and tear resistance as well as protection from light, air and moisture vapor. Foil moisture barrier bags can be used anywhere you need to protect equipment and materials from light, air, and moisture. Information required to meet the MIL-DTL-117 TI CE S1 mil spec is printed on these bags in red ink.