1. Closed volume bagging form, suitable for the automatic packing machine; 2. Pre opening of the plastic bag open automatically, facilitate automatic packaging operations; 3. Side is easy to tear off some dental floss, or plane hole, hole is convenient to hang; 4. A perforation allows the end-user to easily access the product by providing a convenient way to tear the bag open. This feature is especially useful when using heavy gauge bags and can be oriented in the horizontal or vertical direction; 5. The bags are made with a clear material on one side and a colored material on the other, typically white. The benefits of a duplex bag are that the print on the colored material is very legible, while the contents inside are still visible from the clear side.