How to Choose Food Packaging Material (Including Frozen Foods)

By Hao Ding, Founder of HUAYN · Last updated October 25, 2026

Choose the film structure as the recipe is finalised. Fat content, moisture, heat treatment, vacuum packing or freezing establish the main requirements, followed by shelf life and the sales channel.

The short version: PET/PE covers dry goods with a short shelf life and everyday frozen foods like fries. PET/VMPET/PE suits chips and crackers that go soft. PET/AL/PE is for nuts, jerky and coffee that go stale. Nylon laminates such as PET/PA/PE handle vacuum-packed meat, bones and shellfish. Retorted meals need an RCPP-based laminate built for the cycle.

New food brands tend to arrive with the same few questions. Why does one quote cost more than another for a bag that looks the same? Does this product really need foil? Will the bag we copied from a competitor survive the freezer, or last twelve months on a shelf? This guide answers them in the order we work through them on a real project.

Four questions about the product come first

The bag's job is set by the food inside it. Answer these before anyone talks about film.

1. How much fat or oil is in it? Fat oxidizes when oxygen gets through the film. Nuts, jerky, roasted coffee and fried foods can taste stale or rancid well before they look spoiled. For these, oxygen barrier comes first.

2. Does it pick up moisture from the air? Crackers, chips and puffed snacks go soft. Here the moisture barrier (often quoted as WVTR) matters more than oxygen.

3. Is it heated after sealing? Pasteurizing, boiling and retorting use different temperature and pressure conditions. Retort processes may operate around 250 °F (121 °C) or at another validated temperature. Specify the actual cycle when selecting films, inks and adhesives. A standard snack laminate can delaminate or leak. In the US, shelf-stable low-acid foods heat-processed in sealed pouches also fall under FDA's 21 CFR Part 113. Our retort pouch troubleshooting guide covers what goes wrong.

4. Is it vacuum-packed or frozen? Vacuum pulls the film tight over bones, edges and hard pieces. Frozen packs are handled cold, and some films turn brittle. Puncture resistance and low-temperature toughness come before barrier.

Two more facts shape the answer: the shelf life you need, and whether you fill finished pouches or form bags from roll film on your own machine. If the format is still open, compare bag types and applications first.

Which material for which product

Find your product below to choose a common starting structure. Set thickness and grades for the pack weight and filling process.

Shelf-stable and chilled products

Frozen products

One case needs extra care: food that's frozen and then cooked or microwaved in the bag. Films that handle heat well are often brittle in the freezer, and the reverse, so the structure has to be tested at both ends. Tell us how the product is reheated before we suggest anything.

The common structures, explained

PET/PE. The everyday laminate. It's clear, prints well, seals reliably at low temperature and costs the least of the laminates, which is why it shows up on so many frozen retail packs.

BOPP/PE. Similar cost to PET/PE with a softer feel in the hand. It's also the route to a matte bag: the matte look comes from a matte BOPP outer film, while a PET outer gives a gloss surface. A matte foil bag usually reads BOPP/AL/PE rather than PET/AL/PE.

BOPP/CPP and PET/CPP. CPP is clear and seals well, but polypropylene sealants can lose toughness in the cold. Fine for dry ambient products. If a supplier offers CPP for a frozen product, ask which grade it is and drop-test frozen packs. We usually start frozen projects on a PE sealant.

Metallized structures (PET/VMPET/PE, BOPP/VMPET/PE). The metallized layer blocks moisture and light, and makes the print look bright. It's the usual step up for chips and crackers. Seals are less forgiving at low temperature, so you see these less on frozen products.

Foil laminates (PET/AL/PE). The highest barrier to oxygen, moisture and light of the common structures. Fully opaque. The safer place to start for high-fat products and long shelf lives.

Nylon laminates (PA/PE, PET/PA/PE, PET/PA/AL/PE). The answer for heavy, angular, bony or vacuum-packed products. Nylon keeps its puncture and impact resistance in the cold. It costs more, so use it where the product needs it.

Retort laminates (PET/AL/PA/RCPP, PET/PA/RCPP). Built to survive the heat and pressure of sterilization. The RCPP sealant, inks and adhesives all have to be rated for the actual cycle.

Plain PE. Single-material PE bags for bulk vegetables, carton liners and outer bags. Cheap and tough, with limited barrier and print quality.

The names hide a lot. In our standard builds the PET and VMPET layers are 12 μm each, and the PE sealant makes up the rest of the total thickness. A shampoo sachet film we produced, for example, was PET/VMPET/PE at 80 μm in total. Two quotes for "PET/VMPET/PE" can describe quite different films.

For other material options, see our metal-free barrier review and compostable film trial checklist.

What changes when the product is frozen

The four common frozen-pack failure modes below each have a specific construction or handling solution.

• Cracking in the cold. Some plastics turn brittle below freezing. Low-temperature impact performance depends on the polymer grade and film construction. Standard CPP and cold-resistant CPP grades have different properties. PE sealants are common in frozen-food packs; check the selected grade at the actual storage and handling temperatures.

• Freezer burn. Ice on the food surface turns straight to vapor and escapes, leaving dry, discolored patches. A weak moisture barrier and too much air in the pack both make it worse. Nebraska Extension treats it as a quality problem rather than a safety one, but it's what shoppers notice.

• Punctures. Bones, shells, frozen edges and hard pieces such as shrimp tails or wing tips press on the film during packing, stacking and transport. Cold film gives less than it does at room temperature.

• Seal failure. A seal that passes on the packing line can open when the frozen pack is dropped, especially if ice or product got caught in it.

Frozen products also travel in more than one layer. Trays hold shaped or fragile items in place, usually PP or PET, so check the tray grade's low-temperature rating. Corrugated cartons take the stacking load. Our part is the printed bag or roll film, but bag size, tray size and carton count should be agreed together.

Why two bags that look the same get different prices

Flexible packaging is priced mainly by film weight. Bag dimensions, total thickness and laminate density establish the weight per bag and the number of bags per kilogram.

• Thickness. For the same bag area and material mix, increasing total thickness from 80 to 120 μm increases film use by 50%.

• Barrier layer. Foil laminate costs more per kilo than metallized film, and nylon adds cost too.

• Gussets. A bottom or side gusset adds film to every single bag.

• Zipper. It's costed by length, so a wider bag carries a longer, more expensive zipper.

• Colors. Gravure prints each color from its own engraved cylinder. That's a one-time cost, and the cylinders are reused on repeat orders as long as the artwork stays the same. More on that in gravure cylinder production.

• Quantity. Our minimum run is usually one 6,000-meter roll of printed film. Bag length and the number of lanes across the web establish the bag count, with smaller bags producing higher counts per roll.

Compare quotations on the same basis. HUAYN lists cylinders, freight and taxes separately from the bag price, so include these items when comparing the total order cost. Read more in where flexible packaging costs hide.

Copy a competitor's bag, or build one for your product?

Copying the structure of a similar product already on the shelf is a fair place to start. It's quick, the films are easy to source and the cost is predictable. It works when your recipe, shelf life and sales channel are close to the product you're copying, or when the first run is a market test.

It goes wrong when two products only look alike. A nut mix with more oil than the one you copied, jerky sold online instead of from a chilled counter, or nuggets in a bigger, heavier family pack all ask more of the film. Stale taste, soft texture, freezer burn or split seals tend to show up months after launch, once stock has sat in a warehouse.

Material changes after launch add film, sampling and testing costs and can leave unused stock. Foil, metallized film and white bases also give the same artwork different color results, so allow time to approve colour again on the new film.

Building a structure around the product takes longer up front. You agree the risks, test two or three shortlisted structures with real product, then commit. It's worth it for anything you plan to sell for years, for high-value products, and for anything going to export markets.

Match the bag to how long, and where, it will be sold

If the product sells through in a few weeks, or the first run is a test, a basic structure is often enough. If it has to last months on a shelf, in a freezer or in transit, budget for a higher barrier.

• Grocery shelves and freezer aisles. The pack has to stand or lie neatly, show the product and keep its shape for the whole shelf life. A window rules out a foil structure.

• E-commerce. Shipments get dropped, squeezed and stacked. Seal strength and puncture resistance matter as much as the print.

• Export. Containers can sit for weeks in heat and humidity, and each market has its own material rules. For the US, FDA's page on packaging and food contact substances is the place to start; for the EU, check food-contact and chemical rules early too. Our notes on PFAS-free flexible packaging and the regulations section of our pet food packaging guide cover more.

Positioning matters as well. A value product needs the cheapest structure that still passes your tests. A premium product can justify foil, a matte finish or a flat-bottom bag, because the pack is part of what the customer is paying for.

Specs to ask for and tests to agree before launch

A supplier's data sheet is only useful if you know what each figure means and how it was measured.

1. Low-temperature impact. A dart drop test (ASTM D1709 is a common method) shows how much impact the film takes before it breaks. For frozen products, ask what temperature it was run at. A room-temperature result says little about a pack at 0 °F (−18 °C).

2. Water vapor transmission rate (WVTR). The main barrier figure for soft snacks and freezer burn, in g/m² per 24 hours, often tested to ASTM F1249. Lower is better.

3. Oxygen transmission rate (OTR). Matters most for nuts, coffee, oily fish, meat and fried products, which develop off-flavors as fat oxidizes. In cm³/m² per 24 hours, often tested to ASTM D3985. Lower is better.

4. Seal strength. Ask for it on seals made on the actual bag machine.

Compare barrier figures at matching methods, temperature and humidity. Keep WVTR results at 100 °F (38 °C) and 90% humidity separate from results at 73 °F (23 °C).

Tests on filled packs

Test filled packs with your real product before the first full order, and agree the method and pass mark with your supplier in writing.

1. Seals. Check side and bottom seals, plus the zipper or spout area, which is where many leaks start. For frozen products, check them again after freezing.

2. Drop and compression. Drop filled packs and stack cartons the way your warehouse and couriers will.

3. Filling-line trial. Run the pouches or roll film on your own machine at production speed. Sealing temperature and dwell time change from one structure to another.

4. Storage trial. Keep filled samples in the conditions you expect and check taste, texture and the pack at set intervals.

5. Process trial. For retorted, pasteurized or frozen products, put filled packs through the real cycle.

Use barrier data to choose the structure and filled-product storage trials to establish shelf life. For sample troubleshooting, our guide to 19 common slitting and pouch-making defects helps work out whether the film, the seal or the process is to blame.

Quick checks you can do on samples

Before any lab work, a few bench checks catch the obvious problems. They take about a day and cost next to nothing.

• Look. Hold the film up to the light. It should be even, without gels, black specks or streaks. Check the print registration and the seal edges too.

• Feel. For frozen use, leave a sample in the freezer overnight, then flex it. Suitable film stays pliable. If it crackles or turns stiff and papery, ask questions.

• Smell. A sharp solvent smell from a new bag can mean solvent left over from printing or lamination. Our article on solvent retention and ink migration explains the causes and the tests.

• Water and freeze test. Part-fill a bag with water (it expands as it freezes), seal it and hold it upside down for ten minutes. Then freeze it for 24 hours and drop it onto a hard floor. Look for leaks at the seals and corners.

These are screening checks. They don't replace lab tests or a storage trial with your real product.

What to send us for a quote

You don't need a finished specification. Send what you know and mark what's still undecided.

• The product, with a note on fat and moisture, whether it's solid, powder or liquid, and whether it has bones, shells or sharp edges

• How it's processed and stored: ambient, chilled, frozen, vacuum-packed, pasteurized or retorted

• Target shelf life and the countries it will be sold in

• Finished pouches, or roll film plus your machine model

• Bag size and fill weight, or a reference sample, and whether the product sits in a tray

• Zipper, tear notch, hang hole, or a degassing valve for coffee

• Gloss or matte finish

• Number of designs and quantity per design

• Artwork, if it's ready (AI, PDF, PSD or CDR)

Start with your product and quantity in the packaging configurator, then add the specifications you know. For frozen products, choose "Frozen" under "Storage conditions" and select the packing or filling process separately. Choose "Not sure, please recommend" for material advice, and add shelf life and target markets in the notes. For artwork preparation, our prepress and packaging design team can prepare it for cylinder making.

Frequently asked questions

What is the best packaging material for food?
For common applications, PET/PE suits short shelf lives and everyday frozen foods, PET/VMPET/PE suits moisture-sensitive snacks, PET/AL/PE suits high-fat or long-life products, nylon laminates suit vacuum-packed and sharp products, and RCPP-based laminates suit retorted food. Set the grade and thickness for the product.

Is aluminum foil better than metallized film?
Foil gives a higher barrier to oxygen, moisture and light. Metallized film costs less and is often enough for dry snacks that sell through quickly. For high-fat products or long shelf lives, foil is the safer place to start testing.

Does every food product need a high-barrier pouch?
Choose the barrier level the product needs. A lower-cost structure that meets the storage brief is usually the more economical option.

What is the best material for frozen food packaging bags?
A laminate with a PE sealing layer suits most frozen foods, because PE stays tough at freezer temperatures. PET/PE or BOPP/PE works for fries, nuggets and vegetables. Nylon laminates like PET/PA/PE are better for heavy, bony, shell-on or vacuum-packed products.

Is nylon or PE better for freezer bags?
They do different jobs. PE seals well and stays flexible in the cold. Nylon adds puncture resistance and a better oxygen barrier. Heavy-duty freezer bags usually combine the two.

Can polypropylene (PP or CPP) bags be used for frozen food?
Some grades can, but standard polypropylene films lose toughness around freezing point and can crack when dropped. If a PP-based bag is offered for a frozen product, freeze and drop-test samples before ordering.

How do I prevent freezer burn in packaged food?
Use a film with a good moisture barrier, reduce excess headspace with a suitable bag size or, where the product and pouch support it, vacuum packing, and keep storage temperature steady. Temperature swings speed up moisture loss.

How much does custom printed food packaging cost?
Bag size, thickness and laminate structure establish the main film cost. Zippers, print colors and order quantity complete the quotation, with cylinders, freight and taxes listed separately.

What is the minimum order for custom printed pouches?
At HUAYN, the minimum is usually one 6,000-meter roll of printed film. Once the bag size and web layout are set, we calculate the bag count.

How long does custom food packaging take?
Set the schedule around material selection and artwork approval. A recent roll film project for four shampoo sachet designs took 11 business days from the revised specification to dispatch. A new food product usually takes longer, mostly because of sampling and storage tests.

To compare the next steps, use our stand-up pouch format guide, review the specification checklist for food pouch request form, or check the machine details needed for rollstock request form.

Planning packaging for a new product?

Tell us what the product is, how it's made, how it's stored and where it will be sold, and we'll suggest two or three structures worth testing. HUAYN handles packaging design, gravure cylinder making and printing in one team, so the film, artwork and cylinders are all worked out against the same specification.

Build your packaging brief, see how we ran the shampoo sachet roll film project, or email hello@hhuayn.com.

About the author

Hao Ding is the founder of HUAYN, a flexible packaging manufacturer in Shandong, China. He works with food brands on packaging design, gravure cylinders, printed pouches and roll film.