Seaweed packaging has moved well past the concept stage. A growing cluster of material innovators — led by UK-based Notpla and US-based Sway — have gone from lab prototypes to live commercial deployments with recognizable brands across food service, sports venues, and fashion. If you’ve had a drink at Tottenham Hotspur’s stadium or ordered from Kwalitaria’s 160 Dutch fast-food locations recently, you’ve likely encountered packaging made partly from seaweed.
This guide breaks down the main companies making seaweed-based packaging, which brands are actually deploying it right now, and an honest look at where scalability still hits a wall — so you can judge whether this material is right for your supply chain or just useful to watch.
Quick Answer
Seaweed-based packaging is commercially available and actively used by real brands — it is no longer purely experimental. Notpla supplies food-service containers to major UK and European venues, Sway’s compostable polybags are rolling out with fashion labels like Faherty and prAna, and Evoware produces edible sachets for food brands in Southeast Asia. However, production capacity, cost relative to plastic, and supply chain infrastructure still limit broad mainstream adoption. It’s scaling, but not yet at mass-market parity with conventional plastics.
The Main Companies Building Seaweed Packaging
Notpla (UK) is arguably the furthest along in food-service applications. Founded in London and winner of Prince William’s 2022 Earthshot Prize, Notpla coats cardboard food containers with a thin layer of seaweed extract, creating grease-resistant, home-compostable trays and boxes — no plastic lining needed. Their product line now spans over 50 designs including takeaway containers and a ‘SeaView’ deli range with transparent seaweed windows. They have raised over €23 million in a Series A+ round to expand into the US market.
Sway (US) targets the apparel and fashion industry with its TPSea™ material — a thermoplastic seaweed compound that produces compostable polybags and mailer bags. The material is 100% bio-based, microplastic-free, and prints with algae-derived ink. Sway was named a TIME Best Invention of 2025 and its bags became available through packaging suppliers EcoEnclose and Atlantic Packaging starting in 2024–2025.
Evoware (Indonesia) focuses on fully edible and water-soluble packaging, primarily for food brands. Their seaweed-based sachets can dissolve directly into hot water — a format tested for noodle soup seasonings that eliminates the sachet as waste entirely. Products are halal-certified and locally sourced. Loliware (US) has taken a different angle, engineering seaweed-derived resins it calls SEA Tech Resins, which it licenses to manufacturers looking to replace petroleum-based plastics at the material level rather than finished-product level. B’ZEOS has worked with Nestlé to prototype seaweed-based food packaging, signaling interest from a major CPG player.
Which Brands and Venues Are Actually Using It?
In food service and events, Notpla has the most visible real-world deployment. Its seaweed-coated containers are used at Twickenham, Tottenham Hotspur Stadium, Aston Villa, the Kia Oval, Johan Cruijff Arena in Amsterdam, and the ExCel Centre in London. IKEA’s Oxford Street London restaurant has adopted Notpla packaging, and fast-food chain Kwalitaria rolled out seaweed-coated fry trays across all 160 of its Dutch locations — fully compliant with EU Single-Use Plastics rules. Earlier event partnerships include Just Eat at the UEFA Women’s Final and Lucozade sachets at the London Marathon.
Heinz has trialed Notpla’s seaweed sachets for condiments. In fashion, Sway’s compostable polybags are being deployed by Burton, Faherty, Florence Marine X, Alex Crane, and prAna for garment shipments, with J.Crew listed as an earlier retail partner following Sway’s 2023 Tom Ford Plastic Innovation Prize win.
Is Seaweed Packaging Ready for Scale? Honest Assessment
The honest answer is: it depends on your application. For premium or mid-tier food service, event hospitality, and fashion apparel bags, seaweed packaging has crossed the threshold from pilot to production. Notpla’s venue and restaurant footprint shows it can survive demanding real-world use. Sway’s partnership with multiple fashion brands and its listing on major packaging marketplaces confirms commercial availability.
Where scale still breaks down: cost remains higher than conventional plastic, and that gap is more significant at high volumes. Seaweed naturally lacks the tight barrier properties of plastic — it won’t keep oxygen, moisture, or grease out the way a plastic liner does, which is exactly why it composts, but it also limits the application set. Large-format food manufacturers requiring long shelf-life barriers aren’t good candidates yet. Production capacity is the other ceiling — companies like Notpla have noted that some prospective clients want quantities their facilities can’t yet fulfill. Supply chain infrastructure (seaweed harvesting, processing, logistics) is still maturing globally.
The trajectory is clearly upward. Multiple companies have now moved from seed funding to commercial supply agreements, raised significant capital, and built real distribution channels. The question for most brands isn’t ‘will this work someday’ — it’s ‘does my specific application fit what’s available today.’
Tips for Brands Evaluating Seaweed Packaging
Match material to application first. Seaweed packaging excels in short-shelf-life food service (takeaway containers, event cups, sachets), apparel polybags, and anywhere compostability or edibility is a genuine consumer-facing benefit. It is not a drop-in replacement for vacuum-sealed or long-shelf-life food packaging today. Start with a product line where the barrier requirements are modest and the sustainability story is strong — that’s where you’ll see both the best performance and the best marketing return.
Work with established suppliers rather than building custom. Notpla, Sway, and Evoware all have commercial-grade product lines available now. For apparel brands, Sway bags are orderable through EcoEnclose and Atlantic Packaging without requiring a custom R&D project. For food service, Notpla works with packaging distributors like Conpax. Going direct to a company with production infrastructure in place will get you to market far faster than commissioning a bespoke material.
Don’t assume ‘compostable’ means simple for your customers. Home-compostable labeling (which Notpla’s containers carry) is more accessible than industrial-compostable, but you’ll still want clear on-pack guidance. Consumer confusion about how to dispose of novel packaging can undercut the sustainability benefit. Plan the end-of-life communication as carefully as you plan the packaging itself.
Watch the regulatory environment — it’s moving in seaweed packaging’s favor. EU Single-Use Plastics rules have already exempted fully plastic-free formats from certain restrictions, which Kwalitaria’s Notpla rollout benefited from directly. More markets are expected to follow. Brands that pilot seaweed packaging now will be ahead of compliance curves rather than scrambling to meet them.
Explore more: Explore more sustainable packaging guides.
Seaweed-Based Packaging FAQs
Is seaweed packaging actually compostable, or is that marketing?
For the leading commercial products, it’s genuine. Notpla’s seaweed-coated containers are home-compostable — they break down without industrial composting facilities. Sway’s polybags are also certified compostable. Evoware’s sachets are fully edible and dissolve in water. The key distinction is that seaweed packaging composts precisely because it lacks the durable barrier properties of plastic — that’s a feature, not a bug, for these specific applications.
How does seaweed packaging compare to plastic on cost?
It costs more than conventional plastic, and that gap widens at high volumes. Production infrastructure is still scaling, which keeps per-unit costs elevated. Brands adopting it currently absorb some premium either as a sustainability investment or pass it along as a differentiator in premium product lines. Costs are expected to decrease as supply chains mature and production volumes grow, but they are not at parity with plastic today.
Can small businesses buy seaweed packaging, or is it only for big brands?
Small businesses can buy it today. Sway’s compostable seaweed polybags are available through EcoEnclose and Atlantic Packaging with no minimum order requirements suited only for large brands. Notpla works primarily through distributors, so contacting their distribution partners is the right starting point for food-service applications. The availability is real — it’s not limited to enterprise-scale procurement deals.
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Photo by Ben Wicks on Unsplash.