EMP Cover EMP Bags Kit - Four Pack, 15"x19" (Fits Most Laptops): NASA Proven 45 dB Faraday Cage Shielding Electronics, 100x More Than Military Spec Four pack of 15 inch wide x 19 inch tall EMP Cover shielding bags. (Note: size is internal, usable space in the flat pouch. Please allow space for the thickness of your items.) Our third-generation bags: combines special Faraday cage closure with industrial zipper seal for IP66-grade water-tight and dust-tight protection. Also includes desiccant bags to remove moisture inside your sealed bags, protecting your stored electronics. NASA-Proven EMP Cover Bags Protect Against Strong EMP Attacks: To protect against an EMP attack, you need 45 dB of shielding. That amount of shielding will protect against a high-altitude blast created using the largest warheads. (See our EMP simulator for more details.) Not all silver bags are the same. Tests at NASA show up to 49 dB of protection, with an average of 45 dB protection. That is 10 times more protection than required by the highest military specification (MIL-PRF-81705 Type I). Bags that just meet the military standard only provide 1/10th the protection you need. That is why EMP Cover shielding bags are "Beyond Mil-Spec." Even worse, some vendors sell regular anti-static bags as EMP protection. Regular anti-static bags create a very weak Faraday cage, only 1/80th of what you need. EMP Cover bags are available in a range of sizes. Search Amazon for "EMP Cover".