The Certified Container Kit (p/n 186007088) contains 4 certified 1 L bottles, 3 certified 500 mL bottles with LC caps in standard sizes. The Low Volume Kit (p/n 186007278) contains 5 certified 250 mL clear bottles, 1 certified 500 mL clear bottle, and a clean container cap kit. Each container is uniquely processed, treated, and sealed in a