Octagonal sealing bags also known in Chinese as square-bottom bags, square-base bags, or flat-bottom bags are flexible packaging containers made from composite plastic film materials. They serve as a plastic alternative to folding cartons or corrugated boxes. Featuring a square shape, these bags offer five printable surfaces—front, back, left, right, and bottom—and achieve product protection through the lamination of films with varying barrier properties. Compared to traditional packaging, flat-bottom bags offer superior stability when standing upright and occupy less space, thereby reducing transportation and storage costs.
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