Review on Get a Fluorescent Set of 4 Soft TPU Cases for Apple AirTags - Protective, Lightweight, and Waterproof with Key Ring for Convenient Tracking and Security by Todd Phillips

I bought a few to wear with the Air Tags that I put on my dog's collars. At first they worked very well, but after a few months I noticed that they were losing their ability to remain completely leakproof. At first it started with slightly noticeable moisture, then they just collected water. I thought maybe it's just high dog activity, but the one I keep in my purse doesn't seem to stay shut either. I find that just movement and use over time will cause the plastic to warp slightly. This leads to a reduction in compression. You get what you pay for I guess which is why I'm giving them 4 stars. They are still very reliable air tag cases despite not being waterproof.