1. Small kraft paper bags, which are generally large in number and widely used, are required by many businesses to be cheap and durable. Usually, the kraft paper bags are formed by machines, attached with ropes and completely operated by machines. 2. The method of medium-sized kraft paper bags. Usually, medium-sized kraft paper bags are hand-made kraft paper bags after being pasted and molded by machines. Because the forming equipment of kraft paper bags is limited by the molding size, and the method of kraft paper bags is limited by machines. Many bags can't be finished by machines alone. 3. Large bags, brown paper bags with inverted heads, and thick yellow brown paper bags. These brown paper bags should be made by hand, and can only be made by hand. The production cost of these brown paper bags is high, and the quantity is not large. 4. No matter which kraft paper bags are above, if the quantity is not large enough, they are usually made by hand, because the loss of kraft paper bags made by machines is large, so there is no way to solve the problem of small quantity of kraft paper bags.