How about the weight of the packing bag

　　Weight=density * volume=density * 42 * 18 * 0.00007=0.05292 * density (g), about 1g for 20 bags.

　　Plastic bags are bags made of plastics (commonly used plastics include polypropylene, polyester, nylon, etc.) as the main raw materials. They are indispensable items in people's daily life and are often used to hold other items. It is widely used because of its advantages of low cost, light weight, large capacity and easy storage. However, it is prohibited to produce and use plastic bags in some countries because of its shortcomings of extremely long degradation cycle and difficult treatment.

　　The invention of plastic bags has brought great convenience to human life, but more and more people do not know how to use them effectively for environmental protection, leading to the globalization of plastic bag pollution.

　　Compared with traditional plastic bags, environment-friendly bags have the following advantages:

　　1. Water solubility speed can be designed and selected, completely dissolved in water, non-toxic and pollution-free;

　　2. High tensile strength and good tension;

　　3. High transparency and good luster;

　　4. High softness and good touch;

　　5. Good oil and solvent resistance, heat sealing and printing;

　　6. Low permeability and good gas resistance;

　　7. Plastic snap fastener or self-adhesive plastic bag can be added;

　　8. Excellent anti-static performance, no dust collection, etc.

　　9. It can be degraded by water, air, sunlight and biology. Usually, it can be decomposed into harmless substances in about a month.

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