Personally, I don't want to know why someone would want one of these, but just in case you do, well, here you go. No need to share details on what you plan to put in it. Seriously. No need.
These glass vials are shaped like a fang and hold whatever weird stuff you want to put in them! Best of all the vial's cap has a loop so you can wear this as an amulet!
•Vial measures 1.5" long
•Constructed from glass with metal end and screw cap
•Loop for attaching to a necklace