Many supermarkets now that their shopping bags are environmentally friendly, but industry insiders, in fact, the current high costs for bags, and the government is not mandatory, market bags are not many, Zhexie called "green bags" mostly non-toxic non-environmentally friendly bags, but the human body and the environment will have some adverse effects. And some non-green bags that can not be used for loading of food, especially cooked food, after using non-green bag will cause spoilage, causing people to produce food poisoning symptoms after eating. So, what is the distinction between the green bags and non-green bags do? The industry to teach you a simple way: air bags into the water, sinking the green bags, floating in the water right and wrong bags.