1, 17x750px, which are basically smaller than the common express bags in the market, and have little impact on the bag cost;

2, 20x800px, the size is close to the size of A4 paper, which is suitable for the packaging of conventional small articles;

3, 25x875px, larger than A4 paper, suitable for sending documents;

4. 28x 1000px commonly used by express delivery companies is also used more;

5, 32x 1 125px, electric business, mainly making clothes;

6, 38x 1300px, e-commerce is used to install autumn clothes;

7.40x 1375px, the specification of the express bag used to hold plush toys;

8, 45x 1500px, mainly used for winter clothes;

9, 60x2000px, used less, mainly used for e-commerce bulky items, small household appliances, furniture.

10. Express bags are used for logistics express delivery and e-commerce product transportation. Their main function is to cover and protect the transported products. Therefore, the courier bag needs to have high shading and wear resistance, as well as a certain tension and toughness. The film blowing process of express bag usually adopts a three-layer extrusion film blowing machine to blow the film. The inner layer and the middle layer generally adopt fixed LDPE, and the outer layer can be customized according to customers' preferences. The main material with smooth surface of express bag is LDPE, while the material with unsmooth surface is HDPE. LDPE has high gloss, good tensile strength, and HDPE has dull surface and good toughness. These two materials have good film blowing effect and good printing performance, which are very good choices for e-commerce sellers who pursue exquisite printing.