The bag industry is undergoing a material revolution driven by the concept of sustainability. Over the past decade, terms such as “organic cotton” and “recycled polyester” have been widely incorporated into brand product catalogs. Today, however, a more cutting-edge concept is moving from laboratories to production lines—bio-based synthetic materials.
These are not a simple return to natural fibers, nor are they merely recycled versions of traditional plastics. Instead, they rely on modern bio-chemical technologies to extract sugars from plants such as corn, sugarcane, and straw, and then use processes like fermentation and polymerization to synthesize polymer materials whose structure and performance are nearly identical to those of conventional petroleum-based plastics.
For brands, this represents a new opportunity to transition from “petroleum-based chemistry” to “bio-based chemistry,” while also providing additional pathways for the bag industry to meet carbon reduction goals and achieve sustainable development upgrades.
In its thematic research on bio-based textiles, the Joint Research Centre (JRC) of the European Union states that bio-based fibers can be divided into three categories: natural fibers, semi-synthetic fibers, and bio-based synthetic fibers. These three categories are often confused with one another, but distinguishing between them is crucial for brands and manufacturers.
Linen, hemp, cotton, wool, and silk all fall into this category. They are obtained directly from plants or animals and largely retain their natural polymer structures.
Before cotton became widely popular, linen and hemp were the main textile fibers in Europe. They were well adapted to local ecosystems and could also serve as rotational crops to improve soil health.
For the bag industry, the advantages of natural fibers lie in their mature supply chains and their perceptible environmental attributes. However, their limitations are also clear—strength, water resistance, and design flexibility are often inferior to those of synthetic materials.
Viscose, modal, and lyocell are typical examples. They are made by extracting natural polymers (cellulose) from plant sources such as wood, followed by chemical dissolution and fiber regeneration through spinning processes.
Early production of viscose fibers was associated with significant toxic chemical emissions. However, modern processes have improved substantially, particularly with closed-loop production systems that use certified wood and agricultural residues.
In the bag industry, semi-synthetic fibers are often used for linings or lightweight summer bags. They offer a soft hand feel and good breathability, but have relatively low wet strength, making them unsuitable for load-bearing parts.
The core logic of bio-based synthetic materials is to extract small-molecule monomers from renewable biomass sources (such as corn starch, sugarcane, castor oil, lignin, algae, etc.), and then use chemical polymerization reactions to reconstruct entirely new polymer compounds.
The JRC defines them as “a relatively new innovation designed to replace fossil-derived synthetic fibers.” In other words, their final chemical structure can be entirely new or highly similar to petroleum-based materials—the only difference is that the carbon source is shifted from underground fossil fuels to above-ground plant biomass.
For example:
This is one of the most frequently misunderstood concepts by both brands and consumers, and it is a key distinction that bag manufacturers must clearly explain to clients.
“Bio-based” refers to the source of the raw material, while “biodegradable” refers to the end-of-life fate of the material after disposal. There is no necessary connection between the two.
Take bio-based polyethylene (bio-based PE) as an example: its raw material comes from sugarcane-derived ethanol, but after polymerization, its chemical structure is identical to that of petroleum-based PE. This means it retains all the advantages of PE—water resistance, chemical resistance, and high strength—but also inherits its drawbacks: it is virtually non-biodegradable in natural environments.
Conversely, PBAT (a compostable plastic) is biodegradable, but part of its raw materials are derived from fossil resources.
Therefore, when a client requests “bio-based materials,” brands need to ask a key follow-up question: Do you want to reduce dependence on petroleum, or do you require the material to be ultimately biodegradable? These two goals correspond to completely different technological pathways and cost structures.
The following are the main categories that are currently commercially viable and directly applicable to bag manufacturing, ranked by maturity level:
This is currently the most accessible entry point for the bag industry. Traditional PU is produced through the reaction of petroleum-based polyols and isocyanates. Bio-based PU, by contrast, replaces part of the petroleum-based components with polyols derived from plant oils such as soybean oil, castor oil, and cashew nutshell liquid.
Applications in bags:
Current status:
Bio-based content typically ranges from 20% to 70%. The hand feel and physical performance are already close to petroleum-based products, but production capacity and color availability are still somewhat limited. It is recommended that brands confirm the exact bio-based content and customization range with suppliers in advance, and select appropriate solutions based on product positioning.
Fibers made from bio-based polyamide (PA) are already being used in products from internationally recognized bag brands.
Applications in bags:
Current status:
Performance already meets the requirements of most bag applications. However, production capacity and color variety are still less extensive than traditional PA6/PA66.
PLA is currently the only 100% bio-based synthetic fiber that has been commercially produced at scale. It offers high transparency, is thermoformable, and is biodegradable under industrial composting conditions.
Applications in bags:
Limitations:
PLA has relatively low heat resistance (typically below 60°C). It is also prone to hydrolysis under hot and humid conditions, making it unsuitable for high-temperature environments or long-term load-bearing components.
DuPont’s Sorona® is a typical example. Its 1,3-propanediol (PDO) monomer is derived from corn fermentation and is then polymerized with terephthalic acid to form PTT fibers.
Applications in bags:
Current status:
It is often used in blends with cotton or recycled polyester.
This is one of the most talked-about new materials. It is made by growing mushroom mycelium on agricultural waste, forming sheet-like materials that resemble leather. Brands such as Stella McCartney, Adidas, and Hermès have explored collaborations and trials using this material.
Applications in bags:
Current status:
Production capacity is still limited, making it more suitable for small-batch premium lines or conceptual products.
Currently, there is no unified global certification standard for bio-based synthetic materials. Different regions and organizations have introduced their own certification systems, each with different focuses. The most commonly used certifications include:
These certifications are not only required for export compliance but also serve as credible proof of the material’s environmental attributes to customers. It is important to note that different certifications focus on different aspects: some only certify bio-based content, while others also assess the sustainability of raw material cultivation and production processes. Therefore, brands can choose the appropriate certification based on their target market and customer requirements, without blindly pursuing multiple overlapping certifications.
Q1: What is the core difference between bio-based synthetic materials and traditional petroleum-based materials?
A: The fundamental difference lies in the source of carbon.
Their raw materials come from fossil fuels buried underground (such as oil and natural gas). The carbon in these resources has been stored underground for millions of years. Extracting and using them releases “geological carbon,” increasing the total amount of carbon dioxide in the atmosphere.
Their raw materials come from contemporary biological resources (such as corn, sugarcane, straw, and algae). The carbon they contain is captured from the atmosphere through plant photosynthesis, making them part of the “modern carbon cycle.”
Q2: Do bio-based synthetic materials perform worse than petroleum-based materials?
A: It depends on the specific material type and application scenario.
Bio-based PE and PET have nearly identical molecular structures to their petroleum-based counterparts. Therefore, tensile strength, tear resistance, and heat resistance can remain comparable.
Bio-based PLA has a relatively low melting point (around 150–160°C). This means processing parameters must be adjusted for high-temperature pressing or high-frequency welding applications.
Some bio-based PU materials may show slightly faster yellowing under long-term UV exposure compared to petroleum-based PU. This can be improved through the use of additives.
Overall: Bio-based materials already meet the performance requirements of most standard bag applications. However, in extreme environments (high temperature, strong acids or alkalis, or prolonged outdoor UV exposure), material-specific testing and validation are still necessary.
Q3: Are plant-based materials and bio-based materials the same concept?
A: In most consumer contexts, the two terms are used interchangeably. However, strictly speaking, “plant-based” is a subset of “bio-based,” and the scope of bio-based materials is broader.
The raw materials come exclusively from plants (such as corn, sugarcane, cotton, and bamboo).
The raw materials can come from a wider range of biological resources, including plants, animals, algae, microorganisms, and even agricultural waste and food residues.
Q4: How can consumers tell whether a bag truly uses bio-based materials?
A: The most reliable way is to check third-party certification labels, rather than relying solely on marketing claims.
Widely recognized international certifications include:
Indicates the specific percentage of bio-based content.
Classifies products into three levels: 20–50%, 50–85%, and >85% bio-based content.
Uses a 1–4 star rating system.
Authentic bio-based products typically display certification marks and bio-based content percentages clearly on hang tags or care labels.
Q5: How is the “bio-based content” on product labels measured?
A: The globally accepted testing method is radiocarbon analysis (Carbon-14 analysis), based on standards such as ASTM D6866 and ISO 16620.
The principle is relatively straightforward: all living organisms (plants and animals) absorb atmospheric carbon-14 through photosynthesis or the food chain during their lifetime. In contrast, fossil fuels are extremely old, and their carbon-14 has completely decayed.
By measuring the amount of carbon-14 in a sample, it is possible to accurately calculate the percentage of bio-based carbon in the total organic carbon content.
For example, if a fabric is tested to have 35% bio-based carbon content, it means that 35% of the organic carbon in that material comes from renewable biological resources rather than petroleum.
Further reading:
What is organic cotton?
https://www.synberry.com/organic-cotton-in-bag-manufacturing
What is rPET?
https://www.synberry.com/guide-to-rpet-fabric
What is recycled nylon?
https://www.synberry.com/why-brands-are-switching-to-recycled-nylon-for-bag-manufacturing
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