Great product. I highly recommend testing the bag with the Faraday test app and/or sticking a phone/radio in and texting. I tested it and all my first tests failed because I didn't close it properly. I wish they had a video pointing out some important things to close properly. You fold it like you would a paper lunch bag, making sure the sides are folded, touching the top evenly, then fold it FIRMLY twice so the velcro will hold it in place.