| 摘要 |
The present invention provides a flexible bag comprising at least one sheet of flexible sheet material assembled to form a semi-enclosed container having an opening defined by a periphery. The opening defines an opening plane, and the bag has an upper region adjacent to the opening and a lower region below the upper region. The upper region has a preferential elongation axis perpendicular to the opening plane which permits the upper region to expand in response to an externally-applied force upon the bag, while the lower region has a preferential elongation axis parallel to the opening plane which permits the lower region to expand in response to forces exerted by contents within the bag to provide an increase in volume of said bag. The bag therefore exhibits increased stability in use and is easier to close.
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