Poly Mailer

Brief Introduction of Poly Mailer

Poly mailer refer to the bags used in the express industry to transport documents, receipts, materials, and goods. Also known as courier bags, mailing bags, and express packing bags.


The most widely used plastic express bag is made of polyethylene material, which has the characteristics of low cost, convenient use and good waterproof performance. In addition to the use of customized express bags by major express companies, there is also the online shopping industry. In order to give customers a good image, as well as to enhance the image, and play a role in publicity, they will customize their own unique express bags. Increase sales

Poly Mailer Classification

Express Plastic Bag Material: low-density polyethylene (LDPE) usually referred to as PE, high-density polyethylene (HDPE) usually referred to as PO, express plastic bags have the advantages of low cost and light weight.

The difference between PE and PO in express plastic bags: PE has better transparency and softness, and the printing color is brighter; PO has relatively good mechanical properties; PE is used as the main material in domestic express bags, but it is generally used in foreign countries. PE and PO are combined as the main materials of express bags.

Poly Mailer Classification

 Courier Document Cover Material: generally gray-bottomed whiteboard paper, white cardboard, cow cardboard, mostly. The express industry generally uses paper with a weight of 200 g/m2 to 450 g/m2. Compared with express plastic bags, express document seals have the advantages of being flat and not easily broken.

Poly Mailer Classification

Express bone bag material: bone bag (also known as compact bag, free bag, sealed bag, zipper bag, ziplock bag, English: Ziplock bags, Reclosable Bag, Zipper Closure Bag, Resealable Bag), with polyethylene ( LDPE) and high-pressure linear polyethylene (LLDPE) are blown film forming, heat-cut machine-made bags, made into a plastic bag that can be re-sealed. Bone bags can be used for inner and outer packaging of various small items. The ziplock bag produced with food-grade raw materials can store various small foods, tea, seafood, etc., moisture-proof, waterproof, insect-proof, and prevent things from being scattered

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