Most flexible packaging bags are not made from a single film. They are laminates — two to four layers bonded together, each doing a different job. Choosing the right structure protects your product, controls cost and supports your sustainability goals.
What each layer does
- Outer (print) layer: carries your printed design and gives the bag its look — gloss, matte or paper feel. Common choices: PET, BOPP, kraft paper.
- Barrier layer: blocks oxygen, moisture and light. Common choices: aluminum foil (AL), metallized PET (VMPET), or high-barrier coated films.
- Inner (sealant) layer: touches the product and forms the heat seal. Usually PE or CPP.
Common structures and where to use them
- PET/PE: clear, economical, good for dry snacks, candy and non-sensitive products.
- BOPP/CPP: crisp and clear, popular for bakery, bread and lightweight items.
- PET/AL/PE: maximum barrier against oxygen, light and moisture — ideal for coffee, nuts, powders and long shelf life.
- Kraft paper/PE or Kraft/AL/PE: natural paper look with food-safe lining; the foil version adds high barrier for coffee and tea.
- PET/NY/PE: nylon adds puncture resistance — good for heavy products, frozen food and spout pouches.
- Mono-PE: all-polyethylene structures designed for easier recycling.
Questions to ask before choosing
- How sensitive is the product to oxygen, moisture and light?
- What shelf life do you need?
- How heavy is the fill, and does it have sharp edges?
- Will it be frozen, microwaved or hot-filled?
- Do you want customers to see the product through a window?
- Do you need a recyclable or compostable structure for your market?
There is no single “best” material — the right structure balances protection, appearance, cost and sustainability for your specific product.
Planning a custom packaging project? Send us your requirements — our team will recommend the right solution and reply with a quote within 24 hours.