Abstract: A bottle includes male threads formed on an outer bottom surface; a hollow protrusion formed on a base of the bottle protruding inwardly toward an interior of the bottle and having an opening formed on a top of the hollow protrusion; a silicon rubber layer disposed on a bottom of the bottle having an elastic protrusion snugly received in the hollow protrusion and a slit formed on a top of the elastic protrusion; a base casing having female threads formed on its inner surface engageable with the male threads of the bottle and having a vent formed in a central portion of the base casing; and a disposable liner bag having a reinforced wall made of silicon rubber formed on a central location of the bag, having a cut positioned at the center of the reinforced wall. The slit on the elastic protrusion and the cut on the liner bag remains closed in normal (non-suction) condition, thereby preventing the milk or liquids from dripping out.

Abstract: A bottle with male threads on the outer bottom surface and a protruding surface on the base thereof; a silicon rubber layer provided with an elastic protrusion which has a slit on the top; a base casing with female threads on its inner surface and a minute vent centered thereon. The slit on the elastic protrusion remains closed in normal (non-suction) condition thereby, preventing the milk or liquid inside the bottle from dripping out. Once the bottle is inverted and the nipple is sucked, the slit opens a certain amount to let the air flow into the bottle. Thus, milk flows out of the nipple continuously during suction.