| 摘要 |
Described is a plastic bottle fitted with a one-way check valve and an inner bladder containing a substance such as mustard or ketchup. When squeezed, the substance is dispensed from an inner bladder through an aperture in the top. When released, air is allowed into the bottle through the valve to displace the substance dispensed. Since the valve will not allow air out of the bottle, the bladder continuously shrinks until all the substance is dispensed without any waste or the need to strike the bottle or store it upside down. No air comes into contact with the substance thus avoiding bacterial contamination.
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