| 摘要 |
A collapsible bag which is adapted to have another bag stacked thereon when the collapsible bag is filled with material. The collapsible bag includes a main body, a bottom portion, and a top portion. The main body defines a plurality of vertical sections to provide columnar support for holding the bag upright when the vertical sections are substantially filled with material. The bottom portion depends from the main body and includes at least one bottom seal for closing the bottom portion, wherein the bottom portion defines a substantially planar base. The top portion extends from the main body at an end opposite the bottom portion. The top portion includes a top seal for closing the top portion. The top portion defines an interior space within the bag between the top seal and an imaginary fill line. The top portion also includes a vent between the top seal and the fill line, whereby air within the interior space is vented to the atmosphere in response to downward pressure on the top portion to collapse the bag onto its contents. A substantially planar top surface is formed along the fill line to facilitate stacking the bag.
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