Abstract: An adjustable sealed can comprising a can body having an top opening for a cap to close on and a bottom opening defined by a circumferential inwardly extending short wall closed by a bottom plate movable upward and downward in a hollow interior, the cap having an elongate block on top provided with a pumping chamber for a pumping rod to fit and reciprocate therein to pump out the air in the can body through an air valve fitted in a vertical valve hole in the inner end of the pumping chamber by manual reciprocating movement of the pumping rod, with the movable bottom plate being moved up as food stored in the can body is gradually taken out and the air therein pumped out.