Open Top VOA Vials. Quality Environmental Containers. Available in clear 33 expansion and amber 51 expansion borosilicate glass. Open top vials come assembled with polypropylene caps with low-bleed 0.125" PTFE/silicone septa inserted (.135" septa for E-series vials). Sizes are 20mL, 40mL, and 60mL. Preparation Levels for products.