Flexible Packaging LCA: How Life Cycle Assessments Compare Packs

An LCA comparison can favour a lighter pack while hiding product lost through inadequate protection. Compare the same quantity of usable product, with equivalent shelf life, before comparing environmental impacts. A flexible packaging life cycle assessment covers defined material, production, transport, use and disposal stages; this page helps you check its assumptions, not select a universal winning pack.

The ISO 14040 and 14044 framework

ISO 14040:2006 sets out the principles and framework for LCA, and ISO 14044:2006 gives requirements and guidelines. Their July 2006 editions have subsequent amendments listed on ISO’s official pages; record the amendments used by the study. In principle, a study has four phases:

1. Goal and scope. What question is being answered, for whom, and what is compared. This is where the functional unit and system boundaries are set.
2. Inventory analysis. Collecting data on inputs and outputs, such as materials, energy, emissions and waste, for each stage.
3. Impact assessment. Translating the inventory into impact categories, such as climate change, water use or resource use.
4. Interpretation. Drawing conclusions, checking sensitivity and stating limitations.

For a comparison intended for public disclosure, check the applicable critical-review requirements and the review statement. A reference to ISO alone does not demonstrate that review occurred.

Functional unit and product-to-package ratio

The functional unit defines what is being compared. For packaging it should be tied to the job the pack does, usually per unit of product delivered in the right condition to the consumer, for a stated shelf life. Comparing “one pouch with one bottle” is not meaningful unless both deliver the same amount of product with the same protection.

The product-to-package ratio is the amount of product delivered per amount of packaging material. Flexible packaging often scores well here because a pouch can use much less material than a rigid container for the same content. See flexible vs rigid packaging for the format comparison.

A fair functional unit also covers:

• Product mass or volume delivered.
• Required shelf life.
• Protection against damage, so that a lighter pack that causes more breakage is not credited unfairly.
• Secondary and transport packaging needed per unit of product.

System boundaries and end-of-life assumptions

System boundaries say which stages are inside the study. “Cradle to gate” stops at the factory gate and does not include use or disposal. “Cradle to grave” runs through end of life. Comparing a cradle-to-gate study of one pack with a cradle-to-grave study of another is a common error.

The effect of end-of-life modeling depends on the product, study boundary and impact category. Check these assumptions without assuming that disposal dominates:

• What share goes to landfill, incineration with or without energy recovery, or recycling in the region studied.
• How recycling is credited, and whether credits for recycled content and for recyclability are both counted.
• Whether the pack is actually collected and sorted in practice or only recyclable in principle.
• How composting is treated, and whether the facility exists.

These choices are methodological as well as factual. Two studies using different allocation rules for recycling can reach different conclusions from similar data.

Why flexible packs use less material yet score poorly on recyclability

Flexible packaging is often lighter per unit of product than rigid alternatives, and an LCA can show low material use and lower transport impacts. At the same time, multilayer laminates are hard to recycle in current systems, and collection of flexible packaging is limited in many places. Both statements can be true.

An LCA and a recyclability assessment answer different questions. The LCA asks about impacts across the life cycle. A recyclability assessment, such as those under design for recycling guidelines, asks whether the pack can be sorted and processed in existing recycling streams. A pack can do well on one and poorly on the other. Treat both as inputs, and do not let one stand in for the other. For recycling routes in more detail, see recyclable flexible packaging.

Food waste and shelf life in the comparison

Where the product has a larger impact than its packaging, product loss can change the comparison. If a pack with higher barrier keeps food fresh longer and reduces waste, that may outweigh the extra packaging material. If a lower-barrier pack leads to more spoilage, the saving on materials may be lost.

A credible comparison therefore states:

• The shelf life each pack achieves under stated conditions.
• The assumed food waste rate for each, and where that number comes from.
• Whether the study treated the product as in scope or excluded it.

Be wary of studies that ignore product loss, and equally wary of ones that assume large waste reductions without data. See packaging and shelf life for how shelf life is determined, and barrier film for the barrier side.

How to read and question an LCA

Use the record below to connect each question to evidence. Enter a report page or dataset reference and a finding, including “not supplied,” rather than accepting a headline percentage.

An assumed loss-rate sensitivity example

Example, assumed inputs: deliver 1,000 kg of usable product. Let loss be a fraction of product entering the delivery system. Required input = 1,000 ÷ (1 − loss rate).

These are arithmetic scenarios, not measured waste rates or LCA results. They show why “per pack” and “per kg delivered” can use different denominators. A study must apply its actual inventory and impact factors to the required product and packaging; this example cannot say which pack has lower emissions.

Record the excluded stages and the recycling-credit allocation separately so credits are not counted twice.

Assumptions that change LCA results

Using LCA alongside other packaging evidence

LCA works best as one input among several. Combine it with line trials, barrier and shelf-life testing, cost and recyclability checks. For a first pass, an LCA tool or screening study can point to hotspots, but a public claim needs a full study that follows ISO 14040 and 14044 and, where required, review. Regulatory rules on environmental claims and packaging, including Regulation (EU) 2025/40 in the European Union, differ by market, so confirm requirements for each destination.

When comparing options such as mono-material packaging with a laminate, or paper-based and compostable alternatives, ask each supplier for the assumptions as well as the conclusion. The overview on the sustainable flexible packaging page shows how the main options trade off.

Sources and method

ISO 14040:2006 and ISO 14044:2006 official summaries and amendment listings, linked above, reviewed October 9, 2026. They identify the assessment framework, not results for a particular packaging system. The sensitivity example is an explicitly assumed mass calculation; no environmental impact factors, measured losses or supplier LCA results are used.