This is a sample vial holder for fountain pen ink samples specifically from the Goulet Pen company (no affiliation). I designed this to hold my many vials upright in storage and to prevent them from tipping over when I have the vial uncapped.

There's also a smaller, single vial holder for when you only want to deal with one. Useful for syringing inks or a quick glass pen test of an ink.

Simple, minimal, stable.

Enjoy!