For years I've tried several different oil vials, but none have lasted very long- until this one. I keep them in my keychain, so they're always getting bumped around, jostled, etc. Invariably, the cap and body pieces would begin to unscrew just enough so that the oil leaks past the O-ring. Yhis is the first vial I've ever had (since 1991) that has stayed sealed! I have been so pleased with mine that I bought one for my ministering brother (former member of our branch presidency). Shipping charge was not unreasonable and it arrived promptly.