Whatman 6516-5000 Klari-Flex Bottle-Top Filtration System, 500mL Capacity (Pack of 24) Volume: 500mL; comparable to CapitolBrand CBRL-1172 Polystyrene bottle; PP Securegrasp bottle cap; additional head space to allow 15% dilutions Cap allows for easy uncapping, tightening and bottle stacking, and provides a large surface for bottle labeling Low extractable substances; good alcohol compatibility; radiation sterilized Crystal clear bottle; high visibility graduations; AutoFil stable base