This aluminized moisture barrier bag is designed to provide a static safe environment for sensitive electronic devices. A stronger polyester layer helps to prevent sharp trays from puncturing the bag. The bags are heat sealable and suitable for vacuum packaging. Bags are printed with ESD and moisture warning symbols and a lot code for traceability. 3M Moisture Barrier Bags Dri-Shield 2700 are manufactured from a laminate of multiple layers of aluminized polyester and polyethylene. Polyester provides puncture resistance. Metal layers are intended to provide shielding of Electrostatic Discharge (ESD) and to help minimize the penetration of electric field. These bags are tested to meet or exceed certain electrical and physical requirements of ANSI/ESD S541, and to be ANSI/ESD S20.20 program compliant. Bags are RoHS Compliant and lead-free.