Available in two sizes, SLNT's portable Faraday Dry Bag keeps you and your most essential items ��� phone, wallet, tablet, keys ��� safe from a variety of threats: water, of course, at up to 30 feet for 30 minutes, but also cellular, WiFi, Bluetooth, GPS, RFID, NFC, satellite, and navigation signals, but also EMP, solar flare, key fob and EMF radiation. That means this matte black, durable nylon bag prevents water damage while blocking wireless communication, too, using a proprietary Multishield Faraday Shielding Material liner. And it does so without looking suspicious or overtly high-tech. Shaped like a tube, it features a roll-down clip closure with an adjustable strap, which means it can be carried on its top by the handle or carried like a messenger bag. The strap comes off, though, should you want to store it in a vehicle or inside another bag.