Review on Wurumi Waterproof Case 2 Pack for AirTag - Protective Silicone Skin Cover with Sealing Strip and Carabiner - Compatible with AirTag 2021 - Anti-Scratch and Shockproof - (Black&Green + Green&Yellow) by Pete Hahn

Haven't tried the full range of security tag holders but this one has won so far. This is a very soft rubber with a tiny hole where you can press an air marker. Then Part X wraps things up. Please note there is a cut out on one side to get into a hole that is only on one side. I had to take the X off and turn it over as I didn't notice. As far as water resistance is concerned, I'm rather skeptical. The Airtag is already waterproof, which helps. But this case is not airtight/watertight. Instead, it basically covers the air label around the Apple logo or the plastic side, so I'll say it's going to be MUCH harder for water to get in, but "waterproof" is a higher standard. The cost was perfect. I wouldn't spend more on it, but less would make it "cheaper" if it's a good product. I paid €7.99 for it.