Types of Packaging Materials for Fermented Dairy Products

Fermented dairy products like yogurt, kefir, buttermilk, and sour cream are living foods-they contain active bacterial cultures that keep working even after production. This makes packaging more than just a container; it’s a critical factor that determines shelf life, product safety, flavour retention, and even the survival of beneficial probiotics. Choosing the right packaging material involves balancing barrier properties, weight, cost, environmental impact, and compatibility with the product inside. Let’s break down the major types of packaging materials used for fermented dairy products and what makes each one suitable-or not-for the job.

Why packaging matters for fermented dairy products 🔗

Fermented dairy products are sensitive to light, oxygen, moisture loss, and temperature changes. Unlike shelf-stable foods, these products contain live cultures that continue metabolic activity during storage. Packaging must manage gas exchange carefully-allowing some carbon dioxide to escape while limiting oxygen ingress that can cause oxidation and off-flavours. At the same time, it must prevent moisture loss, which affects texture and weight. According to research published in the AIMS Microbiology journal, the packaging of fermented dairy products plays a key role not only in preserving freshness but also in maintaining the viability of probiotic organisms throughout the product’s shelf life. A poor packaging choice can lead to flavour defects, texture changes, reduced probiotic counts, and ultimately, consumer rejection.

Glass packaging 🔗

Glass is one of the oldest packaging materials used in the dairy industry. Before plastics became dominant in the mid-20th century, glass bottles were the standard for milk and fermented dairy products. Even today, glass remains a preferred choice for premium and artisanal fermented products such as set yogurt and specialty kefir.

Advantages of glass 🔗

Chemical inertness is perhaps the biggest advantage of glass. It does not react with the acidic environment of fermented dairy products (which typically have a pH between 3.5 and 4.5), meaning there is zero risk of chemical migration into the food. A study published in the Journal of Dairy Science confirmed that glass is the best material for preserving dairy flavour, outperforming both plastic and paperboard containers in sensory tests.

Excellent barrier properties set glass apart from other materials. It is completely impermeable to gases, moisture, and microorganisms. This means fermented products stored in glass are well-protected against oxidation and dehydration-two common causes of quality deterioration during storage.

Transparency allows consumers and quality inspectors to visually assess the product without opening the container, which builds trust and enables non-invasive quality checks.

Recyclability is another strong point. Glass can be recycled indefinitely without any degradation in quality. It can also be washed, sterilised, and reused multiple times, which makes it an environmentally sound option when a return-and-reuse system is in place.

Heat resistance means glass containers can withstand pasteurisation temperatures, making them suitable for heat-treated fermented products.

Disadvantages of glass 🔗

Weight is a significant drawback. Glass containers are considerably heavier than plastic or carton alternatives, which increases transportation costs and the carbon footprint associated with distribution. Fragility adds another layer of concern-glass can break during handling, transit, or on store shelves, leading to product loss and safety hazards from broken shards. The higher production cost compared to plastic also makes glass less economical for mass-market fermented dairy products. These factors explain why glass is now largely reserved for premium or niche fermented products rather than everyday yogurt and buttermilk.

Plastic packaging 🔗

Plastics dominate the fermented dairy packaging market today, and for good reason. They are lightweight, versatile, cost-effective, and can be moulded into a wide range of shapes and sizes-from single-serving cups to large tubs. Several types of plastics are used, each with distinct properties suited to different fermented products.

Types of plastics used in fermented dairy packaging 🔗

High-impact polystyrene (HIPS) is the most widely used plastic for fresh yogurt packaging. As noted by New Food Magazine, thermoformed HIPS cups pigmented with titanium dioxide (TiO₂) are the industry standard for fresh yogurt, typically sealed with an aluminium foil or paper/plastic laminate lid. HIPS is favoured because it is easy to thermoform into cups and tubs, relatively inexpensive, and provides a rigid structure that protects the product.

An important characteristic of polystyrene is its gas permeability. According to research published in PMC (National Library of Medicine), polystyrene is relatively permeable to oxygen, carbon dioxide, and water vapour. This property is actually beneficial for products like set yogurt and sour cream that are fermented directly inside the retail container-the permeability allows gases produced during fermentation to escape, preventing bloating of the packaging.

Polypropylene (PP) is another commonly used plastic, particularly for yogurt tubs and drinking yogurt bottles. It offers better moisture barrier properties than polystyrene and good chemical resistance to the acidic dairy matrix. PP is also microwave-safe, which adds to its versatility.

Polyethylene terephthalate (PET) is used for drinking yogurt and kefir bottles. When pigmented, PET provides good light protection, which helps prevent light-induced oxidation of fats in dairy products. High-density polyethylene (HDPE) is commonly used for bottles of drinking yogurt and fermented milk beverages, often sealed with aluminium foil laminate closures.

Advantages of plastics 🔗

Lightweight nature dramatically reduces shipping costs compared to glass. Design flexibility allows manufacturers to create packaging in virtually any shape, from squeezable pouches to ergonomic cups with peel-off lids. Cost-effectiveness makes plastic the most economical option for high-volume production of everyday fermented dairy products. Plastics also offer shatter resistance, eliminating the safety risks associated with glass breakage.

Disadvantages of plastics 🔗

The main concern with plastic packaging is its permeability. If not properly formulated, plastic containers can allow oxygen and moisture to pass through, leading to oxidation, flavour loss, and reduced shelf life. For long-life fermented products stored at ambient temperature, single-layer plastics typically do not provide sufficient barrier protection-multi-layer or barrier-coated plastics are needed instead.

Another issue is chemical migration. Certain compounds from the plastic can migrate into the product, particularly at higher temperatures. For instance, styrene monomer can migrate from polystyrene cups into yogurt, with higher levels detected in products that are fermented at elevated temperatures directly inside the PS container.

Environmental concerns are also significant. Most plastic dairy packaging is single-use, and recycling rates for food-contaminated plastics remain low globally. This has led to growing pressure on the industry to adopt more sustainable alternatives. Additionally, some plastics can absorb flavour compounds from the product, leading to a gradual loss of aroma during storage-a phenomenon documented in flavoured yogurt stored in polypropylene and polystyrene containers.

Carton-based packaging 🔗

Carton packaging-including waxed paperboard cartons, polymer-coated paperboard, and multi-layer aseptic cartons-plays a major role in the packaging of drinking yogurt, flavoured fermented milk, and long-life fermented dairy beverages. The most recognisable form is the Tetra Pak aseptic carton, which has enabled fermented dairy products to be distributed without refrigeration in many parts of the world.

Structure of multi-layer cartons 🔗

Modern dairy cartons are not simple paperboard boxes. They are engineered multi-layer structures. A typical aseptic carton consists of about 75% paperboard (for structural rigidity), 20% low-density polyethylene layers (for moisture sealing and adhesion between layers), and about 5% aluminium foil (for creating a barrier against oxygen, light, and microorganisms). These layers work together to provide comprehensive protection for the product inside.

For chilled fermented products that don’t require ambient storage, simpler carton structures are used-typically paperboard coated with polyethylene on one or both sides. These are commonly seen as gable-top cartons for buttermilk and drinking yogurt.

Advantages of cartons 🔗

Light weight makes carton packs easy to transport and handle, reducing logistics costs. The product-to-packaging weight ratio for cartons is remarkably efficient-as noted by the European Dairy Association, food-and-drink cartons achieve a product-to-packaging ratio as high as 96:4, meaning only 4% of the total weight is packaging.

Printability is a strong advantage. The flat paperboard surface is ideal for high-quality printing of brand graphics, nutritional information, and marketing messages. Efficient storage and transport is another benefit-cartons can be shipped flat and assembled at the filling plant, saving significant warehouse space compared to pre-formed glass or plastic containers.

For aseptic cartons, the ability to store products without refrigeration is a game-changer, especially in regions with limited cold chain infrastructure. This has enabled the widespread distribution of drinking yogurt and fermented milk in markets across Africa, Asia, and Latin America.

Disadvantages of cartons 🔗

Simple waxed or polymer-coated paperboard cartons lack the barrier properties of glass or multi-layer plastics. Without an aluminium foil layer, they offer limited protection against oxygen and light, which can shorten the shelf life of fermented products. Research has shown that dairy products stored in paperboard cartons can develop off-flavours due to the absorption of product aroma by the paperboard and the transfer of cardboard-derived compounds into the product.

Moisture sensitivity is another concern. If the polymer coating is damaged or insufficient, the paperboard can absorb moisture from the product, compromising both the packaging integrity and the product quality. Cartons are also not resealable in their basic form (though many modern designs include screw caps or flip-top closures to address this).

Recycling complexity is a notable challenge. Multi-layer cartons that combine paper, plastic, and aluminium require specialised recycling facilities to separate the different materials, and such infrastructure is not universally available.

Emerging trends in fermented dairy packaging 🔗

The packaging landscape for fermented dairy products is evolving rapidly. Single-serving and on-the-go formats-such as small plastic cups, pouches, and carton-based portion packs-have seen a surge in popularity as consumers prioritise convenience and portion control.

Sustainable packaging is another major trend. Companies like Tetra Pak are actively working on replacing the aluminium barrier layer in aseptic cartons with paper-based barrier alternatives. These new cartons push paper content to roughly 80% and increase total renewable content to approximately 90%, with a reported 33% reduction in carbon footprint.

Biodegradable and bio-based plastics such as polylactic acid (PLA) are being explored as alternatives to conventional petroleum-based plastics. However, challenges remain around their barrier performance, brittleness, and the limited availability of commercial-scale composting infrastructure.

Active and intelligent packaging is an emerging frontier. This includes packaging that incorporates antimicrobial agents, oxygen scavengers, or freshness indicators to actively extend shelf life or communicate product quality to the consumer.

Choosing the right packaging material 🔗

There is no single “best” packaging material for all fermented dairy products. The choice depends on several factors: the type of product (set yogurt vs. drinking yogurt vs. kefir), the desired shelf life, storage conditions (chilled vs. ambient), distribution distances, target market positioning (mass-market vs. premium), and sustainability goals. Glass is unbeatable for inertness and flavour preservation but impractical for mass distribution. Plastics offer unmatched versatility and economy but require careful formulation to provide adequate barrier protection. Cartons deliver excellent efficiency and printability but need multi-layer engineering for long-life applications.

In practice, most dairy manufacturers use a combination of materials. A yogurt cup, for example, might be made from HIPS with an aluminium foil laminate lid-combining the structural benefits of plastic with the barrier properties of metal foil. This kind of material pairing is the norm rather than the exception in modern fermented dairy packaging.

What do you think? How important is packaging sustainability to you when choosing fermented dairy products? Do you believe the dairy industry should invest more in returnable glass systems, or is the focus on improving recyclability of plastic and carton packaging a better path forward?

References

1. https://pmc.ncbi.nlm.nih.gov/articles/PMC11194616/
2. https://eu.wisfarmer.com/story/news/2023/01/30/glass-cardboard-or-plastic-does-milks-packing-influence-flavor/69852740007/
3. https://www.trvst.world/waste-recycling/advantages-disadvantages-of-glass-milk-bottles/
4. https://www.plastekgroup.com/blog/advantages-and-disadvantages-of-glass-packaging/
5. https://www.newfoodmagazine.com/article/27263/dairy-packaging-materials-and-methods/
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC9323499/
7. https://en.wikipedia.org/wiki/Tetra_Pak
8. https://eda.euromilk.org/wp-content/uploads/2024/05/EDA_Factsheet_-_How_the_dairy_industry_chooses_its_packaging_options_-_Sept_2020.pdf
9. https://www.dairyreporter.com/Article/2023/12/19/a-disruptive-solution-a-closer-look-at-tetra-pak-s-aseptic-carton-with-paper-based-barrier/