Water-resistant signal-blocking storage for laptops, radios and electronicsA normal backpack offers convenience but does not isolate electronics from wireless signals or EMP-related electromagnetic energy. The Faraday Defense Stealth DRY Backpack combines a rugged tarpaulin shell with triple-layer CYBER NC shielding for travel, storage and preparedness.Features Triple-layer CYBER NC nickel/copper shielding Blocks cellular, Wi-Fi, Bluetooth, GPS and RFID signals when properly closed Manufacturer reports approximately 85-90 dB attenuation Roll-top dual-clip closure Water-resistant tarpaulin exterior Reinforced seams Padded shoulder straps and mesh back padding Two mesh side pockets Approx. 16 in H x 11 in W x 6 in D when closed; 22 in H when open Expandable width up to approximately 15 in when packed