This document provides a dual flask for laboratory use, methods of using a dual flask, and systems including a dual flask. A dual flask can include a first flask structure and a second flask structure. Each flask structure can include a body and a neck. The first body and the second body in a dual flask provided herein can be connected together and have a filter there between such that fluids can be filtered between said first and second bodies.
STATEMENT AS TO FEDERALLY SPONSORED RESEARCH
 This invention was made with government support under DE-FC07-06ID14781 awarded by The Department of Energy. The government has certain rights in the invention.