The present invention is a container in the form of a single housing for holding fluid, including a first collapsible reservoir having a first valve. The first reservoir initially contains a volume of fluid. The container also includes a second reservoir, initially empty (or substantially empty), expandable to a second volume. The second reservoir has a second valve. As the volume of said first reservoir decreases, the volume of the second reservoir proportionally increases.
GOVERNMENT RIGHTS CLAUSE
This invention is made with U.S. Government support under Contract No. W-7405-ENG-36 awarded by the U.S. Department of Energy. Accordingly, the U.S. Government has certain rights in this invention.