Start with the product, not the pouch
The material structure should follow the product, not the other way around. Coffee needs an oxygen barrier and a one-way degassing valve to release carbon dioxide without letting oxygen in. Snacks need moisture and grease resistance. Pet food needs puncture resistance and a strong seal. Tea needs aroma retention and light protection. Each requirement points to a different laminate.
A common mistake is choosing a structure because it looks good on a shelf or because another brand uses it. That can lead to stale product, leakers or unnecessary cost. Write down the shelf life, the filling method, the distribution route and the retail environment before you request quotes. Those four inputs narrow the material choice faster than any sample wall.
Barrier layers and what they do
Most flexible packaging is a laminate of two or more layers. PET gives printability and stiffness. Aluminium foil (AL) or metallised film blocks light, oxygen and moisture. Nylon (NY) adds toughness and puncture resistance. PE is the sealing layer and provides moisture barrier. A typical coffee structure is PET/AL/PE. A snack or pet food bag often uses PET/NY/PE where strength matters more than absolute oxygen barrier.
Barrier is not binary. It is a set of trade-offs. Higher barrier usually means more layers, more weight and higher cost. If your product is dry and shelf-stable, a high-barrier foil structure may be overkill. If your product is oxygen-sensitive or has a long shelf life, a thin barrier can fail early. Ask your supplier what oxygen transmission rate and water vapour transmission rate the structure targets.
Filling method decides the format
The filling line often determines the pouch format. Vertical form-fill-seal (VFFS) machines run rollstock film and produce pillows or stand-up pouches at speed. Pre-made pouches suit lower volumes, thicker laminates and formats like flat bottom or spout pouches. Spout pouches with corner spouts or STANDCAP are common for liquids, sauces and purees. Side gusset bags work well for coffee and tea where a taller, narrower shape fits the shelf.
Check three things before you commit to a format: the fill weight, the seal area and the opening. A pouch that is hard to open or hard to reseal will get complaints. A zipper adds cost but improves repeat use. A tear notch needs to be placed where the consumer actually tears. These details are cheap to fix at the artwork stage and expensive to fix after a print run.
What drives the price per pouch
Unit price is a function of several inputs, not just size. The main cost drivers are: - Material structure: foil and nylon cost more than mono-material PE or PP. - Print method: rotogravure has higher setup but lower unit cost at volume; digital has low setup and suits short runs. - Order quantity: MOQ starts from 100 pcs for pouches and 10 kg for film with digital printing, or from 10,000 pcs and 200 kg with rotogravure. - Add-ons: valves, zippers, spouts, handles and windows each add material and converting steps. - Lead time: digital print runs take 10-15 working days after artwork approval; rotogravure takes 20-25 working days.
Freight and duties are separate from the unit price. A lower unit price from a distant factory can be wiped out by shipping cost, port delays or a damaged pallet. Ask for the shipping terms and the packaging of the finished goods. Pouches shipped in cartons with proper count and orientation reduce handling damage and make receiving easier.
Sustainability rules that affect design
Recyclability rules are tightening in several markets, and they change material choices. Mono-material PE and PP structures are designed for existing recycling streams in some regions. PLA/PBS compostable films suit industrial composting where collection exists. Degradable options exist but their performance and end-of-life claims vary. Kraft paper laminates appeal to brands that want a natural look, but paper alone rarely provides a sufficient barrier.
The practical approach is to match the claim to the disposal route. If there is no composting collection, a compostable pouch may end up in landfill. If the local recycling stream does not accept flexible film, a mono-material pouch may still not be recycled. Buyers should ask for documentation from the manufacturing partner and check what their own market actually collects. Certifications belong to the factory, not to the brand selling the pouch.
Samples, artwork and common mistakes
Request stock pouch samples first. They are free; you pay only the courier. Stock samples let you check the feel, the seal, the zipper and the valve before you spend on custom printing. Once the structure is agreed, artwork approval is the gate for lead time. Missing dielines, low-resolution images and unembedded fonts are the usual causes of delay.
Other frequent mistakes include ordering too little film for the first run, forgetting that print colours shift between substrates, and assuming a valve works on every product. Valves are for degassing, not for oxygen-sensitive powders. A window can weaken the structure if placed over a seal. A spout needs a fitment that matches the filling equipment. Fix these in the sample stage and the production run is predictable.