| 摘要 |
A tubular sleeve having an open top, a closed bottom wall, a front and back faces and a pair of opposing side walls connecting the front and back faces. The side walls are formed with at least one gusset allowing the front and back faces to extend from each other. The gussets are sealed unitarily at the bottom ends to form the bottom wall. The "square bottom" bag takes on a triangular lengthwise shape normally biased closed at the top but easily openable for maximum filling and discharge of the interior of the bag.
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