By utilizing the super strong wrapping force and retraction of plastic, the product is tightly and fixedly bundled into a unit, making scattered small parts a whole. Even in adverse environments, the product has no looseness or separation, and there are no sharp edges or stickiness to avoid damage. Form a light, protective surface around the reagent to achieve dust, oil, moisture, and water resistance. By utilizing the retraction force of plastic stretching, the product is packaged to form a compact, non occupying unit, tightly wrapping the pallets of the product, effectively preventing mutual displacement and movement of reagents during transportation.