This vial is simple. There are no frills, no gimmicks, no corny messages, just a vial that is there when you need it, and stays out of the way on your keys when you don't.
When I served a mission, I saw a lot of consecrated oil vial designs, and almost all of them broke at one point or another, except for these. I've carried this vial on my keys for years now, and I have had zero problems. It's scratched and worn, but it still works as well as the day I got it. One thing to be aware of is that when you close this vial, a little bit of oil leaks out, but it never leaks otherwise.
If you're looking for a good oil vial for yourself, another Melchizedek Priesthood holder, or a missionary, this is the one. They also sell it in brass, which is slightly heavier but stronger and will patina nicely. Just get it, it works.