Start with the product, not the pouch
Before choosing a pouch format, list what the product needs. Is it oxygen-sensitive, like roasted coffee? Does it contain fats that can go rancid, such as nuts or pet treats? Is it hygroscopic, like instant tea or dried fruit? The answers determine the barrier requirement, which then narrows the material structure. A flat bottom pouch in PET/AL/PE gives a high moisture and oxygen barrier. A kraft paper laminate suits dry goods with a shorter shelf life. Mono-material PE or PP recyclable structures work when barrier demand is moderate. PLA/PBS compostable options are available for brands that need them.
Format follows function. Stand up pouches sit on a shelf and hold 100 g to 1 kg of coffee or snacks. Flat bottom pouches carry more weight and stack well. Three-side-seal pouches suit small single-serve sachets. Spout pouches, including corner spout and STANDCAP, are common for liquids, sauces and purees. Side gusset bags handle tea leaves and larger fills. Rollstock film runs on form-fill-seal lines for high-volume production. Special shaped bags can differentiate a product on shelf.
Barrier is a number, not a promise
Ask for barrier data in measurable terms. Water vapour transmission rate (WVTR) and oxygen transmission rate (OTR) are the two figures that matter most. A structure with an aluminium foil layer, such as PET/AL/PE, typically delivers very low OTR and WVTR. Metallised PET or a high-barrier coating can reduce cost where foil is not essential. PET/NY/PE offers good puncture resistance and moderate barrier, useful for frozen or chilled items. The right choice depends on the target shelf life, distribution conditions and the sensitivity of the fill.
Add-ons change how the package performs. A one-way degassing valve lets coffee release CO2 without letting oxygen in. A zipper supports resealability for multi-use packs. A tear notch or laser score makes opening predictable. A window shows the product. A spout and cap turn a pouch into a pour-and-store container. A carry handle helps larger formats. A hang hole supports retail peg display. Each addition has a cost and a tooling implication, so decide early.
Filling method shapes the film spec
Tell your converter how the pouch or film will be filled. Vertical form-fill-seal, horizontal form-fill-seal, hand fill and pre-made pouch fill each put different stresses on the material. High-speed lines need consistent seal strength and low coefficient of friction. Hot fill or retort processes require heat-resistant structures and sealants that survive the temperature. Cold fill is more forgiving. If the product is filled by hand, a wider seal and a more rigid laminate can reduce waste. The sealant layer, often PE or CPP, must match the filling temperature and pressure.
Pouch dimensions and fill weight are linked. Overfilling stresses seals and can cause leaks. Underfilling wastes material and looks poor on shelf. A good starting point is to test the target fill weight in a sample pouch before committing to a print run. Free stock pouch samples are available; the customer pays courier only. This lets you check fit, feel and opening before artwork is finalised.
What drives the unit price
Four factors set the price: material structure, print method, order quantity and add-ons. A three-layer laminate with foil costs more than a two-layer PE structure. Rotogravure printing, up to 10 colours, has higher setup costs but a lower unit price at volume. Digital printing has no plate cost, so it suits short runs and frequent design changes. Flexographic printing sits between the two. Zippers, valves, spouts and handles add material and conversion steps. The more complex the pouch, the higher the unit price at any quantity.
Order quantity is the biggest lever. Digital printing starts from 100 pcs for pouches and 10 kg for film. Rotogravure starts from 10,000 pcs or 200 kg. Lead time follows the print method: digital runs take 10-15 working days after artwork approval; rotogravure takes 20-25 working days. If you need to test a market before a large commitment, digital is usually the lower-risk route. Once the design is stable and volume grows, moving to rotogravure can reduce unit cost.
Sustainability rules that affect your spec
Recyclability depends on the whole structure, not one layer. Mono-material PE or PP designs are easier to recycle where collection streams exist. Multi-material laminates with foil or metallised layers are harder to separate. Compostable options such as PLA/PBS require industrial composting conditions to break down. Degradable additives are a separate category and may not be accepted in all recycling systems. Check local regulations and retailer requirements before choosing a sustainability claim. The manufacturing partner holds the relevant certifications for the structures they produce; ask for the certificate scope before you print a logo.
Sustainability also affects performance. A recyclable mono-material may have a shorter shelf life than a foil laminate. Compostable film may have lower heat resistance. If the product needs a long shelf life or hot fill, a recyclable structure may not meet the requirement. The practical approach is to define the minimum barrier and shelf life first, then choose the most sustainable structure that meets it. Avoid claims that the package cannot support.
Common mistakes to avoid
Most problems come from late decisions. Changing artwork after plates are made adds cost and delay. Choosing a pouch format before checking the filling line can lead to jams or poor seals. Ignoring the degassing valve on fresh coffee causes bloated packs. Forgetting a tear notch frustrates consumers. Specifying a window without checking the product's light sensitivity can shorten shelf life. Ordering too few samples to test means issues appear only at full production.
Confirm fill weight and pouch dimensions with a sample. - Match the sealant to the filling temperature. - Check barrier numbers against the target shelf life. - Decide add-ons before tooling. - Verify certification scope for any sustainability claim. - Allow for lead time in the launch plan.