By choosing an appropriate volume insert for your sample volume and vial, you can ensure that the precious sample lasts longer as only the required amount will be extracted and utilized with the Low Volume Insert. The CMS Certified Clear Glass 12 x 32 mm Screw Neck Total Recovery Vial, with Cap and Preslit PTFE/Silicone Septum, 1 mL Volume, 100/pk, is quite similar to this product, but it enables you to store analytes with no traces of contaminants so you get reliable chromatographic results