Do Bagasse Cups Have a Smell? A Supplier’s Take on The Science Behind The Scent (and What It Means For Your Business) Bagasse Cups
If you’ve ever walked a trade show floor, browsed a eco-friendly kitchen supply aisle, or switched from plastic to compostable takeout ware, you’ve probably wondered: do bagasse cups have a smell? As someone who’s been in the bagasse cup supply business for nearly a decade, I get this question all the time—from small café owners testing their first compostable line, to corporate sustainability managers auditing their vendors, to even home bakers curious about how their homemade lattes will turn out. It’s not a trivial question, either. A bad smell can turn a customer’s first sip of coffee into a negative experience, and a persistent scent can tank a brand’s eco-friendly reputation before it even gets off the ground.
Let’s start with the basics: what is bagasse, anyway? For the uninitiated, bagasse is the fibrous byproduct left after sugarcane is crushed to extract juice. It’s a renewable, agricultural waste material—we don’t grow extra sugarcane just to make cups; we use the stuff that would otherwise be burned or landfilled. That’s part of why it’s such a popular alternative to plastic foam or single-use plastic cups. But like all natural plant materials, bagasse is made up of complex organic compounds: cellulose, hemicellulose, lignin, and small amounts of residual sugars, waxes, and minerals. Those compounds are the root of every bagasse cup’s potential smell—both good and bad.
Now, the million-dollar question: do bagasse cups actually smell? The short answer is: sometimes, but not always, and not all smells are the same. Most people will pick up on a very faint, earthy, plant-like scent from a brand-new bagasse cup straight out of the packaging. It’s similar to the smell of wet grass, hay, or fresh wood pulp—subtle, not overpowering, and often unnoticeable unless you press the cup to your nose. That’s normal, and it’s not a flaw. But some lower-quality cups, or cups that haven’t been processed correctly, can develop much stronger, off-putting smells: sour, mildewy, or even a chemical-like odor. That’s the red flag we spend a lot of time avoiding as a supplier.
Why does that smell happen? Let’s break down the science, because it’s not just “plant stuff smells.” The faint, natural scent comes from volatile organic compounds (VOCs) that are inherent to bagasse. When sugarcane is processed into juice, the bagasse is left to dry, right? If it’s dried slowly in natural conditions (like air drying in a controlled warehouse, for example), the mild plant compounds dissipate gradually. But if it’s dried too quickly—often with high heat, to cut down on processing time—some of those compounds don’t break down properly, leaving a more intense, dusty or hay-like smell. That’s one common issue with lower-tier suppliers: cutting corners on drying time to get cups to market faster, which leads to a stronger initial scent.
Then there’s another big culprit: residual sugars. Bagasse still has small amounts of sugar left after juice extraction, usually around 2-3% by weight. When that sugar isn’t fully removed or processed, it can feed mold or bacteria, especially if the cups are stored in humid, warm conditions. That’s when you get the sour or mildewy smell—this isn’t just a cosmetic issue; it’s a sign that the cup isn’t being properly preserved, and it can even affect the taste of hot or cold beverages. I’ve had a client reach out to me three years ago, frustrated because their new bagasse cups smelled like vinegar, and when we tested a sample, it turned out their previous supplier had used raw bagasse with too much residual sugar, stored it in a trailer in the rain for a week before processing, and that’s where the mold started. That’s the kind of problem we guard against with every batch we process.
Wait, but what about the wax or coatings on bagasse cups? A lot of people think the smell comes from the lining, but that’s rarely the case if you’re working with a reputable supplier. Most bagasse cups on the market are lined with a PLA coating (made from corn starch or sugarcane, also compostable) or a water-based wax, not the old petroleum-based coatings you might remember from 10 years ago. Those linings are designed to prevent leaks and make the cup heat-resistant, and when they’re food-grade, they’re odorless. The only time a lining would add a smell is if it’s a cheap, low-quality PLA that wasn’t properly polymerized, leaving leftover monomers that give off a chemical scent. That’s another red flag: if a cup smells like plastic when it’s brand new, that’s almost certainly the lining, not the bagasse itself.
Now, let’s talk about how storage affects smell, because that’s something even our clients sometimes miss. A bagasse cup that’s stored in a cool, dry place will keep its mild, natural scent indefinitely. But leave a stack of cups in a damp back kitchen, near a dishwasher or a produce cooler, and over time, they’ll absorb moisture, grow mold, and develop that sour smell. I’ve had a small bakery client bring us a stack of cups they’d stored in a basement for six months, asking why they reeked, and it was purely storage-related. We tell all our clients: store bagasse cups in a closed, dry bin, away from direct sunlight and moisture, and the natural scent will stay faint.
What about when you use the cup for hot or cold drinks? Does that change the smell? For the most part, no—if the cup is processed correctly. We test every batch of cups we produce by pouring hot coffee (around 190°F, standard for takeout) into a cup, letting it sit for 10 minutes, and then checking for any transfer of smell to the drink, or any off-odor from the cup. We’ve found that high-quality bagasse cups don’t leach scents when exposed to liquids; the mild plant scent will either fade once the cup is damp, or not transfer at all. The only time you’ll notice a smell in the drink is if the cup is low-quality, with leftover mold or chemical compounds. Cold drinks, too: I’ve used bagasse cups for iced tea and lemonade, and the only scent I pick up is the drink itself, not the cup.
Now, as a supplier, how do we ensure our bagsse cups don’t have that unpleasant smell? It’s not just about drying—we follow a strict processing protocol that starts with sourcing our bagasse from certified sugarcane farms in Central America, where the bagasse is milled within 24 hours of sugarcane harvesting to keep it fresh. Then, we wash the bagasse multiple times to remove residual sugars and dirt, before pressing it into pulp. The pulp is air-dried in climate-controlled warehouses for 72 hours, which gives all the volatile natural compounds time to dissipate slowly, instead of locking them in with high heat. Then, when we form the cups, we use a food-grade PLA lining that’s third-party tested to be odorless, no cheap shortcuts there. We also send every batch to a independent food safety lab to test for VOCs, mold, and scent transfer, so we can catch any issues before they leave our warehouse.
I think it’s important to distinguish between the “bad smell” that’s a product of poor processing, and the natural, faint scent that’s inherent to bagasse. A lot of greenwashing campaigns will tell you that “all compostable cups are odorless,” but that’s not true—because all plant-based materials have a natural scent. The difference is that a reputable supplier will process the material to minimize that scent, not eliminate it entirely, and ensure that any off-smells are removed before the cups hit the market. I’ve seen customers walk away from a brand they were considering because their bagasse cups smelled like wet hay, and that’s avoidable—if the supplier cares about processing, not just price.
Let me also address a common myth: some people think that if a bagasse cup has a smell, it’s not compostable. That’s totally untrue. Compostability depends on the material breaking down in an industrial compost facility within 180 days, regardless of smell. A correctly processed bagasse cup, even with a faint plant scent, is still 100% compostable, just like leaves or wood chips. The smell is a separate factor related to processing, not compostability.
So, what does this mean for you, whether you’re a café owner, a event planner, or a retail buyer? If you’re shopping for bagasse cups, don’t just pick the cheapest option. Ask your supplier: how do you process the bagasse? How do you remove residual sugars? Do you test for scent transfer to drinks? A good supplier will have answers to these questions, and will be able to provide third-party test results for VOCs and food safety. If a cup smells strongly, sour, or chemical when you take it out of the packaging, that’s a sign that it wasn’t processed correctly, and you should look elsewhere.
As someone who’s built my business on reliable, high-quality bagasse products, I’ve turned down a lot of orders from clients who wanted a low-price option, because I knew the cups would end up smelling bad and hurting their brand. It’s not just about making a sale; it’s about making sure the compostable alternative works for your business. A takeout coffee customer will choose a cup that doesn’t smell, even if it’s a little more expensive, over a cheaper cup that ruins their drink. That’s why we invest so much in processing and testing—we know that the quality of the cup, including the smell, is what keeps our clients coming back.
Now, I’ll be the first to admit that I’m not a scientist with a PhD in plant chemistry. But after 10 years of testing thousands of batches of bagasse cups, talking to hundreds of clients about their experiences, and refining our processing methods, I know that the answer to “do bagasse cups have a smell?” is nuanced. It’s not a yes or no, it’s a it depends on how it’s made. And as a supplier, that’s the part we control: to make cups that have a faint, natural, unobtrusive scent, no off-putting odors, and that work as well (if not better) than plastic or foam.
If you’re in the market for bagasse cups, or you’ve had a bad experience with a supplier before, I’d love to chat. We can answer any questions you have about processing, testing, or how our cups perform in real-world use. Contact us to discuss your needs, and we can provide samples, test results, and a custom quote for your business.
Wooden Cutlery References
- European Food Safety Authority (EFSA). (2021). “Assessment of volatile organic compounds in food contact materials made from plant-based fibers.” EFSA Journal.
- Food and Agriculture Organization (FAO). (2019). “Bagasse as a renewable material: processing and applications.” FAO Agricultural Services Bulletin.
- Compost Manufacturing Alliance (CMA). (2022). “Standard test methods for odor and food contact suitability of compostable tableware.” CMA Technical Guidelines.
- National Center for Environmental Health (NCEH). (2020). “Volatile organic compounds in compostable food service ware: a review of current research.” U.S. Centers for Disease Control and Prevention.
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.
Address: Shop No.4, Building 1, Ruijing Huating, Hailin City, Mudanjiang City, Heilongjiang Province
E-mail: info03@ecojiaxun.com
WebSite: https://www.shuntongcutlery.com/
