The express bags are classified into express plastic bags, express document seals, express bubble bags, express bone bags, express woven bags, etc.

1. Material of express plastic bag: PE commonly referred to as low density polyethylene (LDPE) and PO commonly referred to as high density polyethylene (HDPE). The express plastic bag has the advantages of low cost and light weight.

The difference between PE and PO in express plastic bag: PE has good transparency and softness, and the printing color is bright; PO has good mechanical properties; PE is generally used as the main material in domestic express bags, while PE and PO are generally used as the main material in foreign express bags.

There are two categories of polyethylene express bags in the market: new material express bags and recycled material express bags

2. Materials of express document seals: generally white board with gray background, white cardboard, kraft linerboard, mostly. The express industry generally uses paper weighing from 200g/m2 to 450g/m2. The express document seal has the advantages of being flat and not easy to break compared with the express plastic bag.

3. Material of express bubble bag: a transparent soft packaging bag filled with air from the middle layer of air cushion film It is mainly used for packaging small, fragile, easily damaged and less precise goods in the express industry. The express bubble bag is equipped with a shock absorption bubble film. There are countless small bubbles in the bubble film, so it is light, elastic, and has good shock absorption, impact resistance, corrosion resistance and other advantages.

4. Material of express bone bag: bone bag (also known as compact bag, which is made of random bag, sealed bag, chain clamp bag, self sealing bag, English: Ziplock bags, Recyclable Bag, Zipper Closure Bag, Resealable Bag). It is a kind of plastic bag that can be repeatedly sealed, which is made of polyethylene (LDPE) and high-pressure linear polyethylene (LLDPE) through blow molding and hot cutting machine bags. Bone bag can be used for inner and outer packaging of various small items. The self sealing bags made of food grade raw materials can store all kinds of small food, tea, seafood, etc., and prevent moisture, water, insects and things from scattering.

5. Express woven bag: also known as snake skin bag. It is a kind of plastic used for packaging, and its raw materials are generally polyethylene, polypropylene and other chemical plastic raw materials. The woven bag is generally white or grayish white, which is generally less harmful to human body. Although it is made of various chemical plastics, it has strong environmental protection and recycling efforts; It is mainly used for packaging and packaging of various articles, and is widely used in industry.

The express bags are classified according to raw materials: new material express bags, semi new material express bags and recycled material express bags.

Express bags are classified according to whether they are printed: printed express bags, non printed express bags.

The express bags are classified according to whether the bottom organ is folded: there is a bottom organ, and there is no bottom organ.

Express bags shall be subject to whether additional bags are added: with additional bags, without additional bags.