Flexible Packaging Material Guide: Choose the Right Film Structure

Choose the right film structure for your product — and stop guessing.

This flexible packaging material guide explains how flexible packaging is built from layers, what each film does, and how to match a film structure to your product. Picking the right structure is the single biggest factor in shelf life, look, and cost. Below are the common structures we use at DSS Pack and how to choose between them.

What Each Packaging Layer Does

• BOPP / PET — print and stiffness. PET is stronger and more temperature-resistant.
• MPET / AL (aluminum) — barrier. MET (metallized) is light; AL foil is maximum barrier.
• CPP / PE — sealant. CPP for heat resistance, PE for cold resistance and tear strength.
• PA (nylon) — puncture resistance for heavy or sharp products.

Common Flexible Packaging Film Structures

Structure	Best for	Barrier
BOPP/MCPP	Snacks, dry food, light barrier needs	Medium
PET/MPET/CP	Coffee, pet food, aroma & oxygen sensitive	High
PET/AL/PE	Long shelf life, light-sensitive, retort	Maximum
BOPP/PE	Frozen food, cold seal, IQF	Medium
PA/PE	Heavy, sharp, or vacuum-packed products	Medium-High
PET/PE	General purpose, cost-effective	Medium

Looking for a specific format? See our stand up pouch, flat bottom pouch, and rollstock film pages for structure options available per format.

Packaging Barrier Properties, Plainly

Two numbers matter: OTR (oxygen transmission rate) and MVTR (moisture vapour transmission rate). Lower is better. Coffee and pet food want low OTR to keep aroma and prevent rancidity. Snacks and powdered products want low MVTR to stay crisp. Aluminum foil structures give near-zero transmission; metallized films are a lighter, cheaper step down.

Match the Film Structure to Your Product

• Coffee & tea — PET/MPET/CP or PET/AL/PE, plus a one-way degassing valve. See our coffee packaging guide.
• Snacks — BOPP/MCPP or BOPP/PE for crispness and shelf appeal. See snack packaging.
• Frozen food — BOPP/PE or PA/PE rated to -40°C. See frozen food packaging.
• Pet food — PET/MPET/CP or PA/PE for heavy-duty, reclosable bags. See pet food packaging.

Not Sure Which Packaging Material to Pick?

Tell us your product, fill weight, and target shelf life. We’ll recommend a structure, send material samples, and confirm print and accessory options. Most custom samples are ready in 7–10 days.

Frequently Asked Questions About Packaging Materials

What is the most common flexible packaging film structure?

For dry snacks and light-barrier needs, BOPP/MCPP is the most common and cost-effective structure. For aroma- and oxygen-sensitive products like coffee or pet food, PET/MPET/CPP is the standard choice.

What does a stand-up pouch film structure look like?

A typical stand-up pouch uses a 3-layer structure such as PET/MPET/PE or BOPP/MPET/PE, often with a zip lock and, for coffee, a one-way degassing valve. See our stand up pouch page for format details.

Is aluminum foil better than metallized film?

Aluminum foil gives near-zero OTR and MVTR (maximum barrier), ideal for long shelf life and light-sensitive products. Metallized film (MPET) is a lighter, cheaper step down with good but not total barrier.

Can I get recyclable packaging material?

Yes. Mono-material PE structures are recyclable in many regions and trade some barrier for sustainability. See our recyclable flexible packaging materials guide for details.

How fast can I get material samples?

Most custom material samples are ready in 7–10 days after we confirm your product, fill weight, and target shelf life.