Improve the productivity of your lab with just one vial with our new sampling option - from as low as 4 µl to up to 1,4 ml. Micro-V Tapered MicroVials (Flute vials) Although 12x32mm flat bottom 2mL vials are still the mainstay of the chromatography vial market, an increasing number of small volume sampling options have led to more flexibility when working with limited amounts of sample.