Custom Printed Retort Pouches for Shelf-Stable Meals and Sauces

What is a retort pouch and how is it different?

A retort pouch is filled, sealed and then cooked inside its own pack. The sealed pouch goes into a pressure vessel, the retort, where steam or hot water holds it at around 121 °C for long enough to sterilise the food.

That step is what sets it apart from a normal pouch. An ordinary PE seal layer softens at those temperatures and the seals fail, so a retort pouch uses a sealant made for the job.

Because the food is sterilised in the pack, the pouch does no more work on shelf than a tin. The customer opens it at the tear notch, heats the contents and eats.

Which foods are packed in retort pouches?

Anything wet that would once have gone in a can. UK meal brands, Indian and Thai sauce makers and pet food producers are the main buyers, along with outdoor meal companies and caterers.

The full set of heat-processed and spouted styles sits in our retort and spout pouch range for comparison.

• Ready meal curries, stews and chilli for one or two
• Cooked rice, lentils and grain side pouches
• Soups, stocks and sauce bases for restaurants
• Wet cat and dog food in 85 g to 400 g portions
• Camping and expedition meals eaten from the pouch
• Baby food purees sold at ambient temperature

Why does a retort pouch need a special laminate?

Three things happen in the retort: heat, pressure and steam. Each layer of the pouch has to hold its shape and its bond through all three, then cool without delaminating.

The outer PET layer carries the print and takes the heat. The foil in the middle blocks oxygen and light so the sterilised food stays stable. The inner sealant layer, usually cast polypropylene rather than PE, makes the seal and survives the cycle.

Retort-grade, food-contact and high-barrier films are available on request and confirmed on your quote. The job of each layer is set out in our barrier films and laminates guide.

Flat or stand up: which retort pouch shape?

Both shapes go through the same process. The choice comes down to where the pouch is sold and how it is heated at home.

What size retort pouch holds a 400 g ready meal?

A 400 g single meal is often around 160 × 230 mm as a stand up pouch with an 80 mm gusset. A flat pouch for the same weight runs a little larger because it has no gusset to hold the volume.

The shape of the food matters as much as the weight. Rice packs densely, so a 300 g rice pouch is smaller than a 300 g pouch of stew with liquid.

Leave room above the fill line for the seal and for the small amount of expansion during the cycle. We size the pouch from your portion weight, your product density and your seal bar width.

Seals, tear notches and the retort cycle

Retort seals run wider than ordinary pouch seals, often 8 to 10 mm, so there is margin if a seal edge picks up a trace of sauce. A clean seal is still the goal, which is why many lines wipe the seal area before closing.

The tear notch is cut into the side seal above the fill. Customers open the pouch from there after heating, so it needs to sit where a hand can grip the pouch without squeezing the hot contents.

There is no zipper on a retort pouch. The plastic profile distorts in the steriliser and the pouch is eaten in one sitting anyway.

How do you fill and process retort pouches?

You need a filler, a heat sealer with a wide bar and access to a retort, either your own or a co-packer's. The sequence below is the one most small producers follow.

1. Fill the pouch through the open top, keeping sauce off the seal area.
2. Remove air from the pouch by hand pressure or vacuum before sealing.
3. Seal with a wide bar at the temperature set for the sealant layer.
4. Load pouches into retort trays so steam reaches both faces.
5. Run the validated time and temperature cycle for that product.
6. Cool under pressure, dry the pouches and check seals before packing.

Printing on retort pouches

The ink is printed on the inside of the outer PET layer and then laminated, so it sits between film layers. Steam and handling never touch it, which is why retort print stays sharp after the cycle.

Plate print suits long runs of one design. Full colour digital suits several recipes in small volumes, where each flavour has its own front panel.

Keep a plain band around the tear notch and the seal edges, and send vector files where you can. Our guide to pouch artwork and dielines covers the rest, and our designers send a free proof.

Mistakes that cause retort pouch failures

Running an ordinary PE pouch through a retort is the expensive one. The seals open in the vessel and the batch is lost. Say retort on the brief and we quote the right film.

Overfilling is the second. A pouch with no headspace swells in the cycle and splits a seal, and a pouch with too much air floats in the tray and heats unevenly.

The third is sealing over product. A grain of rice in the seal makes a channel, and that channel lets air in weeks later. Wipe the seal area or fill through a nozzle that keeps it clean.

Retort pouches for pet food brands

Wet cat and dog food moved from tins to pouches years ago, and small UK pet food makers now follow the same route. A 100 g flat pouch is a common single-meal size for cats.

Dog food runs larger, often 150 g to 400 g, and a stand up shape helps the pack sit on a pet shop shelf. Pouches for dry treats and kibble need a zipper instead and are a different product on our pet food pouches for treats and kibble page.

How to order retort pouches

Tell us the portion weight, the recipe type, whether it is flat or stand up and roughly how many you need. Include your sealer bar width and your retort cycle if you know them.

Quantities are quoted per order, from £0.25 per unit, confirmed on a written quote. You approve a free design proof, then production takes 4–6 business days and free tracked UK delivery takes 2–3 business days.

Misprints or damage reported within 10 days with photos are reprinted or refunded. Send the brief through the written quote request page, by email or on WhatsApp.