The Mission Darkness™ Dry Shield Backpack 40L is the world's most advanced large water-proof Military-grade Faraday pack that completely blocks all wireless signals and keeps large electronic devices shielded to prevent hacking, tracking, spying, and chain of custody corruption. Protects the data on your devices from Radio Frequencies (RF), Electromagnetic Frequencies (EMF) and Electromagnetic Pulses (EMP), whilst protecting you from radiation emitted by your devices. The Faraday liner on the inside has two layers of high-shielding TitanRF™ Faraday Fabric, which is lab tested and certified to shielding effectiveness standards MIL STD 188-125 (shields against High-altitude Electromagnetic Pulses) and IEEE 299-2006 (effectiveness of electromagnetic shielding enclosures).