I find it pretty good, but have a few issues in getting it to fit right. I like that it fully hides/holds the airtag and I like that it sits up a little higher under the seat so it's less obvious. How it fits under the seat is actually pretty difficult to get out once it's installed on a seat post too, which is good if someone nefarious is trying to strip it down. It didn't quit easily fit on the rails and might not fit all saddles, depending on how flexible the seat is. I'm a little concerned the lid doesn't hold on by any other means than friction. I might add just a little dab of glue, so it's truly stuck, and then has to be pried open with a knife. (edited)
@DavieBIN Thanks for the opinion and pictures, it turned out great. This Airtag holder was made for a specific type of seat from SQLab, so there may be compatibility issues; that's why I added a link with the STEP file.
I find it pretty good, but have a few issues in getting it to fit right.
I like that it fully hides/holds the airtag and I like that it sits up a little higher under the seat so it's less obvious. How it fits under the seat is actually pretty difficult to get out once it's installed on a seat post too, which is good if someone nefarious is trying to strip it down.
It didn't quit easily fit on the rails and might not fit all saddles, depending on how flexible the seat is.
I'm a little concerned the lid doesn't hold on by any other means than friction. I might add just a little dab of glue, so it's truly stuck, and then has to be pried open with a knife. (edited)