In the past paper bags were commonly used by sellers when handing goods to the customers. These bags were generally made by old newspapers and other kinds of used books, khatas and magazines. These paper bags could be used only once and new paper bags were needed whenever something was sold and bought. But when modern technology discovered plastic and polythene, a single bag made of these synthetic materials could be used again and again. They are durable, waterproof and preservable. But plastic bags have a dangerous side also. They are not nature-friendly, not being absorbable in the soil. If burnt, the gas produced by it pollutes the air. If thrown away into drains they choke them because they are soluble in water and do not decompose. Fields strewn with plastic bags lose their arable quality. There may come a time when plastic bags thrown into rivers may choke them and destroy their flow.
