Breather system and roof for sealed storage structure

Claim 1

A STORAGE STRUCTURE, COMPRISING A FOUNDATION, A GENERALLY CYLINDRICAL HOLLOW MEMBER HAVING AN OPEN TOP VERTICALLY MOUNTED ON THE FOUNDATION, SAID FOUNDATION AND HOLLOW MEMBER ACTING TO PROVIDE A STORAGE CONTAINER IMPERVIOUS TO AIR AND MOISTURE, A FLEXIBLE BAG DISPOSED IN THE OPEN TOP OF THE HOLLOW MEMBER AND PROVIDING THE SOLE ENCLOSURE FOR SAID OPEN TOP, A FIRST PORTION OF THE BAG BEING EXPOSED ABOVE SAID OPEN TOP OF THE MEMBER AND A SECOND PORTION BEING DISPOSED WITHIN THE MEMBER, THE FIRST PORTION OF THE FLEXIBLE BAG BEING DISPOSED FOR EXPANSION FROM THE OPEN TOP OF THE HOLLOW MEMBER TO THE ELASTIC LIMIT OF THE FIRST PORTION OF THE FLEXIBLE BAG, SAID BAG BEING DISPOSED IN SEALING RELATION WITH THE INNER CYLINDRICAL WALL OF SAID MEMBER OVER A SUBSTANTIAL VERTICAL DISTANCE, AND CONNECTING MEANS FOR CONNECTING THE PERIPHERAL PORTION OF THE BAG TO THE OUTER SURFACE OF THE HOLLOW MEMBER TO LIMIT THE INNER AND OUTER AXIAL MOVEMENT OF THE BAG WITH RESPECT TO SAID MEMBER.