If you want to maximize the barrier properties of the packaging bag and isolate external oxygen, moisture, sunlight, etc., you can consider aluminum foil pouch. The aluminum film does not come into contact with food, so it also meets the safety standards for food contact materials.
Popular Film Laminations:
1. PET/VMPET/PE
2. PET/AL/PE
3. PET/VMPET/PA/PE