Start with the product, not the pouch
Pet food covers a wide range: dry kibble, semi-moist, wet food in trays or pouches, treats, freeze-dried pieces, and powdered supplements. Each behaves differently in a pack. Kibble is abrasive and can puncture thin films at the seal. Wet food carries moisture and fat that attack adhesives. Treats with high fat content go rancid when oxygen gets in. Before choosing a material, list what the product needs protection from: oxygen, moisture, light, grease, or physical damage.
The filling method matters just as much. Vertical form-fill-seal lines, pre-made pouch fillers, and hand packing all impose different demands on film stiffness, seal width, and coefficient of friction. A film that runs well on one machine can jam another. Ask your co-packer for the exact fill temperature, seal jaw pressure, and pouch dimensions before you approve artwork.
Barrier requirements for pet food
Barrier is the single biggest driver of shelf life. Dry kibble is mostly protected against moisture and oxygen. A PET/PE structure handles short shelf life, but for 12 months or more you usually need metallised or aluminium foil layers. PET/AL/PE gives an excellent oxygen and moisture barrier and blocks light. PET/NY/PE adds puncture resistance, which matters for sharp kibble edges and for larger bag sizes.
Wet food and fresh pet food need a higher barrier and often a retort-grade structure. Fat oxidation is the main enemy: it produces off-odours and reduces palatability. If your product contains fish oil, tallow, or rendered fats, specify a structure with an oxygen transmission rate low enough to match your target shelf life. Ask your supplier for barrier data, not just a material name.
Materials and recyclability rules
Mono-material PE and PP structures are recyclable in many kerbside and store-drop schemes. They are a good fit for dry treats and shorter-shelf-life products where barrier demand is moderate. PLA/PBS compostable films suit brands selling into industrial composting channels, but they need dry storage and careful handling. Degradable options exist for specific markets, though they are not accepted by all recyclers.
Kraft paper laminates give a natural look and good stiffness for stand up pouches. They are usually combined with a PE or PLA inner layer for sealability. If you sell in a country with extended producer responsibility fees, check how the material is classified before you commit. A mono-material PE pouch may cost slightly more per unit but reduce packaging levies and simplify on-pack recycling labels.
Filling, sealing and add-ons
Pre-made pouches run on a variety of fillers: auger, volumetric cup, multi-head weigher, and hand fill. Flat bottom pouches stand unaided and hold more product per shelf footprint. Stand up pouches need a stable base gusset. Side gusset bags suit larger formats, often 2 kg to 10 kg. Spout pouches, including corner spout and STANDCAP, work well for liquids, semi-moist food and broths.
Add-ons should be chosen for the product, not the shelf. A one-way degassing valve releases CO2 from freshly roasted or fermented ingredients without letting oxygen in. Zippers and tear notches help consumers, but they add cost and can affect seal integrity if placed poorly. Windows let buyers see the product, but they reduce barrier area. Carry handles and hang holes are practical for large bags.
What drives the unit price
Four factors set the price: material structure, print method, order quantity, and add-ons. Rotogravure printing gives up to 10 colours at low unit cost on long runs, but the cylinders are a fixed cost. Digital printing avoids cylinder charges and works from 100 pouches or 10 kg of film, which suits launches and short runs. Flexographic printing sits between the two for medium volumes.
MOQ changes the maths. Digital print starts at 100 pcs for pouches and 10 kg for film. Rotogravure typically starts at 10,000 pcs or 200 kg. Lead time is 10-15 working days for digital after artwork approval, and 20-25 working days for rotogravure. Free stock pouch samples are available; the customer pays courier only. Ask for a landed cost comparison before choosing a print method.
Common mistakes to avoid
Buyers often approve artwork before confirming the film structure, then discover the pouch does not run on their filler. Others choose a recyclable mono-material for a product that needs an aluminium barrier, then shorten shelf life and pay for it later in returns. Some specify a zipper or valve without checking whether the seal area can accommodate it at the target fill weight.
A few practical checks reduce risk:
Confirm fill temperature, seal width and pouch dimensions with your co-packer.
Request barrier data (OTR, WVTR) rather than a material name.
Test a small run on the actual filling line before committing to a large order.
Check local recycling and EPR rules for the material you choose.
Keep artwork files in the correct colour space and resolution for the print method.