4 Pack Faraday Bags, Faraday Cage for Anti-Theft Anti-Tracking, Waterproof & Fireproof Faraday Bag for Laptops, Tablets, Phones, Car Keys, Black

Works as expected. Light weight. Not bulky. Reasonably priced. Easy to slip in my cellphone and helps one feel a less dependent on the screen time.

I had bought more expensive bags before but decided to try a lower cost on. These are the exact same material as the more expensive ones. As a test I put my cellphone in one and drove to town and back. It completely blocked all signals until I took it out of the bag.

It is sturdy and works as it should.

Tested each bag, not a single one blocked any signals. I even put a device in layers of all four bags (the bags fit inside each other) and still not blocked at all. Worthless junk!

These bags were great good quality