Interesting that this comes up. I have one of these bags for the key fob for my car. If I put my car keys in it the car does not detect the keys. I recently purchased a Samsung Smart Tag+ and when attached to those same keys in the same bag the phone has no trouble finding it. Not sure what to think of that.
Maybe a slightly smaller bag INSIDE of another slightly larger bag. Perhaps two layers would leave everything dark - period. Just a thought.
