A plastic bag with a zipper closure, commonly known as a zipper storage bag or zip lock bag, is a flexible rectangular container made of polyethylene or a similar type of plastic. This bag is usually transparent and can be easily opened and sealed multiple times. The closure mechanism can be either a slider, similar to a zip fastener, or by manually pressing the sides of the bag together to create a seal with one's fingers.

Zipper storage bags are available in various sizes, ranging from small dimensions like 1.5 by 2.5 inches (3.8 cm × 6.4 cm) to larger sizes like 9 by 12 inches (23 cm × 30 cm). The thickness of the material, measured in gauge, can vary, with smaller bags typically ranging from 40 to 45 µm.

These bags are commonly used for storing food items such as sandwiches or in freezer storage and jewelry items. Travelers can rely on grip seal bags to prevent suitcase leaks and spills. These bags provide a protective barrier for delicates, smarter clothing, and liquids that have the potential to leak and cause inconvenience during transit.

They are also popular for packaging and selling small individual items, as their transparent nature allows for easy visibility. The convenience of the zipper closure makes it easy for users to access and reseal the bag as needed.

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