Snap Top Plastic Vial
These small plastic vials have a snap on top lid closure that provides a good seal. They're handy for storing fine gold to pickers, even chunky nuggets. Also useful for gem stones, beads or small parts.
Like with any vials, you don't want to leave them full of water on a hot dashboard or out in freezing weather. Water expands as it's heated or frozen and can pop a lid or burst the sides. Fair warning from experience.