1. First-class packaging bag: First-class packaging bag refers to the packaging bag that is in direct contact with the product and used to protect the quality and hygiene of the product. It is necessary to meet a series of hygiene standards and requirements, and ensure that the products are free from external pollution and physical damage. First-class packaging bags are often used in food, medicine and other fields. For these sensitive products, packaging bags are required to have certain transparency, so that consumers can clearly see the appearance and quality of the products.

2. Secondary packaging bag: Secondary packaging bag refers to the outer packaging bag, which is used to protect the primary packaging bag and products and increase the wear resistance and protection of the packaging. The secondary packaging bag can provide additional protection to prevent the primary packaging bag from being damaged, punctured or contaminated. The transparency requirement of secondary packaging bag is relatively low, and more attention is paid to its durability and appearance effect.

Transparent bag is a common packaging material, made of transparent plastic material, which has good transparency and can clearly display the items in the bag.