A bottle includes a cap secured on top and having a pipe extended upward and communicating with the interior of the bottle. A pump device is disposed on the cap for vacuuming the bottle. A bellows member is engaged on the pipe and includes a lower end secured to the cap and an enclosed upper end. A cover is engaged on the cap and includes an aperture for allowing the enclosed upper end of the bellows member to move upward beyond the cover. The enclosed upper end of the bellows member may be moved downward for indicating a vacuum status of the bottle when the bottle is vacuumed by the pump device.
