1. The materials used for medium sealed food bags generally include: OPP+CPP, PET+CPP, PET+PE milky white, OPP+PE milky white, and there is a sealing line on the back of OPP+VMCPP bags, which is called medium sealed. 2. Three side sealed food bags are generally made of OPP+CPP, PET+CPP, OPP+VMCPP, PET+VMCPP, OPP+PE, PET+PE, PET+PE milky white, PET+VMPET+PE PET+AL+PE, OPP+PE, etc. {Common thickness of VMPET: 0.012mm, common thickness of VMCPP: 0.025mm} 3. Vertical non zippered food bag, the materials used are generally: PET+VMPET+PE, PET+PE, OPP+PE, PET+AL+PE, OPP+AL+PE, 4. Vertical zippered food bag, the materials used are generally: PET+VMPET+PE, PET+PE, OPP+PE, PET+AL+PE, OPP+AL+PE, OPP+AL+PE, 5. Three side zippered food bag, the materials used are generally: OP+CPP, PET+CPP, PET+VMPET+PE PE PET+PE, OPP+PE, PET+AL+PE, OPP+AL+PE 6. Organ food bags are divided into bottom organ bags (similar to vertical bags, that is, the bottom is folded in) and side organ bags. The side organ bags are folded on both sides of the bag, which can be opened after loading. The side organ bags are generally side organ middle sealing bags, that is, the side is folded, and the middle of the back is also sealed.