NEW IPC/JEDEC J-STD-033B Moisture Sensitive Caution Label Printed on Foil Moisture Barrier Bag1. Identifies moisture sensitive devices for levels 2, 2a, 3, 4, 5, and 5a as defined by J-STD-020. Does not require additional labeling. Film Laminate Metal Layered 0.0040" (4 mil) Thick Moisture Barrier Bag. Designed for electrostatic discharge (ESD) shielding protection when dry packing components.