Unlike the fabric envelope/bag type faraday blockers, this one seems to work quite well. The fact that the lid covers the top by a good 1.25 inches and it is metal construction does an excellent job in blocking the radio signal. It is bulky, but out of necessity. It is able to hold my remote (Honda), tag and small key ring I use to hold a shopping cart token. I modified it by adding a Case Mate (Pelican) AirTag holder in the (unlikely, but possible) event I misplace or lose the case. This will enable anyone who finds it to get in touch with me. It adds a bit more bulk, but gives added peace of mind. I will update my review in a couple of months to see how well it lasts and functions, but so far it lives up to my expectations. Build quality seems quite good so I am not expecting any issues.
If you have a newer car with remote start/entry/keyless start, I highly recommend this product.