Protects your generators and any other electronic devices small enough to fit inside the bag from an electromagnetic pulse. Those pulses come from nuclear weapon detonation or an EMP weapon. It will redirect the electromagnetic pulse around the device and ground the power surge without any effect to the equipment inside the bag. : Tested and certified MIL-Spec by the US Military.: Protection Level: EMP, HEMP, or other transient EMI's: MIL-SPEC Standard: MIL-SPEC-461G-R5-105: Weight: 5.5lbs: Dims: 16"x20.5"x26.8" (exterior) 15"x19.5"x20" (interior)