If you’ve ever ordered a hot latte to-go or grabbed a cold iced tea from a café that prides itself on sustainability, you’ve probably noticed the lineup of bagasse cups next to the disposable plastic and foam options. As a bagasse cups supplier, I get asked this question all the time—sometimes by café owners auditing their packaging, sometimes by eco-conscious customers scrolling through their local shop’s menus, and even by fellow industry folks sorting post-consumer waste. The question is simple, but it’s one that’s tangled up in a lot of misinformation, conflicting packaging claims, and real-world waste management challenges: Are the lids of bagasse cups also biodegradable? Bagasse Cups
Let’s start with the basics, because a lot of the confusion here comes from the way we use the word “bagasse” and how packaging is designed. For those who don’t know, bagasse is the fibrous byproduct left after sugarcane is crushed to extract juice. It’s a renewable resource—unlike plastic, which is made from fossil fuels, and even unlike some paper products that rely on virgin tree pulp. That’s why we use bagasse for our cups: it’s strong enough to hold hot liquids without leaching chemicals, it doesn’t melt when submerged in ice for iced drinks, and it breaks down much faster than traditional plastic if given the right conditions. But here’s the key part: our bagasse cups are made from 100% bagasse fiber, but the lids? They’re not made from the same material.
Wait, hold on—before you assume that means our lids are plastic, let’s backtrack. As a supplier focused entirely on bagasse-based packaging, we never offer plastic lids. The lids we pair with our bagasse cups are made from a different, but still plant-based, material: PLA, or polylactic acid. PLA is derived from fermented plant starches—usually corn or sugarcane, depending on the formulation. It’s a big part of the sustainable packaging space, but that’s where the debate around biodegradability gets really tricky.
I’ve seen this firsthand with clients who come to us after being told PLA products are “compostable,” only to end up confused when their local waste hauler won’t take them for curbside composting. Let’s be clear: biodegradability isn’t a one-size-fits-all term. The Federal Trade Commission (FTC) in the U.S. has guidelines for green packaging claims, but a lot of brands still use “biodegradable” loosely to mean any product that breaks down, even if it takes decades or requires specific industrial conditions.
So, what does it mean for a bagasse cup lid to be biodegradable? First, let’s define that term properly, per standards set by organizations like ASTM International, which sets testing protocols for packaging and materials. A truly biodegradable material (sometimes called “home compostable”) will break down in a home compost pile—where temperatures range between 90°F and 140°F, there’s a mix of moisture and air, and microbes can access the material—within 180 days, leaving no toxic residue. Industrial composting facilities go a step further: they use controlled, high-temperature conditions (often 140°F or higher) that can break down materials much faster, usually within 90 days.
Our bagasse cup lids are ASTM D6400 and EN 13432 certified, which means they meet the standards for industrial compostability. But here’s the catch: they won’t biodegrade in a backyard compost pile, and they definitely won’t break down in a landfill. Landfills are designed to bury waste as quickly as possible, which creates an anaerobic environment—no oxygen, no light, and almost no microbes that can break down plant-based materials. A PLA lid tossed in a landfill could take decades, even centuries, to break down, and it will release small amounts of methane, a potent greenhouse gas, as it does. That’s not the same as being truly biodegradable for the environment.
I get why this is so confusing for our customers. When they buy a set of bagasse cups and lids, they assume the entire package is a closed, fully sustainable system. And in many ways, it is—better than plastic, for sure. But we have to be honest about the limitations. A few years ago, we had a café client in Portland who switched all their packaging to our bagasse cups and lids, only to get a complaint from a regular customer who found a lid in their backyard compost and said it was “still there” after three months. That’s not a failure on our end; it’s a failure of education. That customer’s backyard compost didn’t reach the high, consistent temperatures needed to break down PLA. If that lid had gone to an industrial compost facility, it would have been fully broken down in less than two months.
Another point that’s often overlooked is the function of the lid. Our lids are designed to be leak-proof, to keep drinks hot or cold for hours, and to seal in aromas—qualities that require a certain level of durability. Bagasse fiber is great for rigid, cup-shaped products, but it’s harder to make a thin, flexible lid from bagasse that won’t crack or leak when put under pressure. The bagasse cups themselves can sometimes come with a thinner bag-based lid, but those have their own downsides: they’re less durable, can leak easily, and are often coated with a thin layer of plastic to prevent moisture, which slows their biodegradability.
We did test bagasse lids a few years back, just to see if we could offer a 100% bagasse solution for both cups and lids. The results were mixed. The lids were fully biodegradable, but they required a thicker fiber to get the same leak-proof seal, which added cost for our clients—something small cafés, in particular, struggle with. They also weren’t compatible with our standard cup designs, so we’d have to retool every cup mold, which would mean passing those costs on to customers. At the end of the day, we decided that offering a consistent, certified compostable PLA lid that pairs perfectly with our bagasse cups was a better, more reliable option for our clients than a cheaper, less functional bagasse lid that would disappoint their customers.
Now, let’s talk about the real-world impact of choosing bagasse cups with certified compostable lids, versus other options. A 2021 study by the Waste and Resources Action Programme (WRAP) looked at the end-of-life of takeout packaging in the UK. The study found that bagasse packaging (including cups and certified compostable lids) had a 70% lower carbon footprint than polystyrene foam, and a 35% lower footprint than petroleum-based plastic cups with plastic lids—even when accounting for the PLA lid production. That’s because bagasse is a byproduct of a crop that’s already being grown for sugar, so it doesn’t require additional land or water to produce. The PLA in our lids uses sugarcane that would otherwise go to waste, so it’s not competing with food crops, as some corn-based PLA does.
But that study also highlighted a key gap: only about 10% of post-consumer takeout packaging in the UK is actually composted, whether industrial or home. Most of it ends up in landfills, or even worse, in the environment as litter. That’s a problem that’s bigger than the packaging itself. No matter how biodegradable a lid is, if it’s thrown on the side of the road, it will take years to break down, and in the meantime, it can harm wildlife—sea turtles, for example, often mistake small plastic or PLA pieces for jellyfish. That’s why, as a supplier, we don’t just sell packaging—we work with our clients to offer guidance on end-of-life options. We send them guides on how to inform their customers about curbside compost programs, how to set up on-site composting for their own waste, and how to reduce overall packaging use in the first place.
There’s also a lot of talk about “home compostable” bagasse lids, and while that’s a growing area of innovation, it’s still in the early stages. A few brands have launched home compostable bagasse lids, but they’re not yet widely available, and they’re more expensive than our current certified lids. As the technology improves and production scales, we’re watching that space closely—we want to be able to offer our clients a 100% bagasse lid option when it makes economic and functional sense. Until then, we stick to what we know works: certified compostable lids that are compatible with our bagasse cups, and educating our customers on how to properly dispose of them.
I’ve also had to address misinformation from critics who say PLA lids are “just as bad as plastic.” That’s not true, but it’s not entirely untrue either. The key difference is that PLA is made from renewable resources, not fossil fuels. When it’s composted in an industrial facility, it doesn’t release any new carbon into the atmosphere—unlike plastic, which releases carbon that’s been locked underground for millions of years. But if it’s not composted, it’s still a material that takes a long time to break down. That’s why we’re big advocates for extended producer responsibility (EPR) laws, which make brands accountable for the entire lifecycle of their packaging. EPR would require that packaging be designed for easy composting or recycling, and that there’s infrastructure in place to actually process it. Until we have that infrastructure, even the best biodegradable packaging is only as good as the system that handles it.
So, to circle back to the original question: Are the lids of bagasse cups also biodegradable? The answer is, it depends on how you define biodegradable. If you mean “will break down in a controlled industrial compost facility within 90 days with no toxic residue,” then yes, our lids are certified biodegradable. If you mean “will break down in a backyard compost pile or a landfill,” then no, they’re not. That’s not a flaw in our products—it’s a reality of the materials and the waste system we’re working in.
As a bagasse cups supplier, my goal isn’t to sell packaging that makes empty promises. It’s to offer products that are better than the alternatives, while being honest about their limitations. For café owners and eco-conscious businesses, our bagasse cups with certified compostable lids are a far better choice than plastic or foam, and they’re easy to communicate to customers. We include labeling on every shipment explaining how to dispose of the lids and cups, and we’re always available to work with clients to figure out the best end-of-life options for their specific location.
If you’re a business owner looking to switch to more sustainable packaging, or if you just have questions about the truth behind biodegradable claims, I’m here to help. The space for sustainable packaging is growing every day, and there’s no one-size-fits-all solution—but with the right information and the right partner, you can make choices that are better for your customers and better for the planet.
Coffee Stirrers References:
ASTM International. (2022). Standard Specification for Compostable Plastics (ASTM D6400).
Waste and Resources Action Programme (WRAP). (2021). Takeout Packaging Lifecycle Assessment.
European Committee for Standardization (CEN). (2020). Compostable Plastics Requirements (EN 13432).
U.S. Federal Trade Commission. (2019). Green Guides for Environmental Marketing Claims.
Mudanjiang Shuntong Environmental Protection Technology Co., Ltd.
Mudanjiang Shuntong Environmental Protection Technology Co., Ltd. is one of the most professional bagasse cups manufacturers and suppliers in China, featured by quality products and good price. Welcome to wholesale eco-friendly bagasse cups made in China here and get pricelist from our factory. Contact us for customized service and OEM service.
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