Made of all sorts of paper by bonding or sewing, paper bag is a flexible packaging container, which is widely used and come in many types. According to its structure, there are several types of paper bags:
Envelope paper bag
Both the opening and the flap lid of the envelope paper bag are on the side with a larger size. It is often used for packaging small paper products, documents or powder products.

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Square bottom paper bag
It has lap joints along the length direction, each side is pleated to make it flat, the bottom is first folded into a diamond shape, then the apex of the diamond is connected at the center, the paper bag is opened and then formed into a square section, which can be placed upright, divided into openings and Closed two.
Often used to package granular goods.
Portable paper bag
Portable paper bags, also called tote bag, are usually made of relatively strong kraft or composite paper material. It has reinforced cardboard at the mouth of the bag and is equipped with a handle for carrying. It is often used for gift packaging.

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Tubular paper bag
It has a relatively high height, the opening and the flap are on the face having a smaller size, and have one or several seams parallel to the long side, the bottom has a folded back edge and is taped to the outside to form a back cover.
M-fold paper bag
Its side is folded into three sides and pleated in an M shape. When used, the paper bag can be expanded into a rectangular cross section, generally having a large volume.

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Valve paper bag
The valve paper bag is a closed paper bag. One end of it is equipped with a valve, and the material is filled into the bag from the valve. The pressure in the bag will cause the valve to close. Such packaging is commonly found in the packaging of granular articles.
At present, plastic bags have been gradually replaced by paper bags, which is a very environmentally friendly practice. The paper bag not only has a variety of shapes and beautiful styles, but also plays a very good advertising role. It is the preferred packaging method for modern people.