The NEST-Z is a 7.0 mil Moisture Barrier 5-layer bags. These bags are great for storage and transportation. They are also built for EMP protection of devices should one ever take place. The NEST-Z bags are tested to meet or exceed certain electrical and physical requirements of ANSI/ESD S541 and to be ANSI/ESD S20.20 compliant. Bags are ROHS compliant and lead-free. These bags feature a Ziploc closure system. Used in packaging, transportation, storage, and EMP protection.