Large volume parenteral applications are characterized by high volume doses of a drug product, which are administered intravenously. Flexible bag systems, which contain a combination of different materials, are often used as container/closure systems. Definitions and regulatory requirements for extractables and leachables testing of large volume parenteral products, will be highlighted. Next, typical sources of extractables and leachables in flexible bag systems for parenteral use will be listed. Emphasis will be put on the specific challenges associated with large volume parenteral applications. Finally, some case studies regarding different designs of extractable studies will be discussed.