The 20″X30″ bag is perfect for your laptop(all sizes), gaming systems, radios and extra accessories. This Faraday bag features an outstanding 38-pound puncture resistance. The multiple layer construction provides full protection against ESD, EMI/RFI and tribocharging. Electrical Properties *EMI Shielding (MIL-B-81705-Rev-C): >40 db Between 1 & 10 GHz *Resistivity-Conductive Metal Layer (ASTM D-257): <2 Ohms/sq. in. avg. *Surface Resistivity (both surfaces) (ASTM I-257 @ 12% RH): <10 12 Ohms. sq. in. *Static Decay (FTMS 101C, Method 4046.1 5000 to 0 Volts): <0.05 Seconds *Capacitive Probe Test (High Voltage Discharge) - (EIA-std 541/Appendix E-1 KV): <8 Volts *Charge Generation-nominal (Modified incline plane Avg. nC/sq.in.):Teflon: -0.09 Quartz: +0.10 Physical Properties *Total Thickness: 7.0 mils *Light Transmission (ASTM D-1003-77) <.01% *Tensile Strength (ASTM D882-83 Method A) 735 lbs. *Tear Strength: (D1004-66 - Notched) MD: 5.8 lbs. TD: 7.5 lbs. *Burst Strength (FTMS 101-C Method 2007 1a) >130 psi *Puncture Strength (FTMS 101-C Method A) >38 lbs. *Elongation (ASTM D822-83 Method A)MD: 40% TD: 74% *Heat Seal Strength (ASTM D-1876-72 Vertrod Sealer) >11 lbs./in width MVTR (ASTM F-1249 @ 100