Soilon: The Eco-Friendly, Biodegradable Tea Bag Revolution

Soilon (ソイロン) is a plant-based mesh made from polylactic acid (PLA) derived from corn starch. PLA is technically a bioplastic, but the distinction matters: it's not petroleum-based, it doesn't shed microplastics into your tea the way PET-mesh and nylon teabags do, and it breaks down into water and carbon dioxide under industrial composting conditions. It's the closest thing to a true plastic-free teabag mesh available at scale right now.

The reason most premium teabag brands have switched to Soilon over the last decade is the microplastic research. A 2019 McGill study found that nylon and PET pyramid teabags release billions of microplastic and nanoplastic particles into a single cup of tea at brewing temperature. Soilon doesn't have that release problem — its plant-derived structure stays stable in hot water.

If a tea brand's pyramid bag isn't labeled "Soilon" or "PLA" or "plant-based mesh," assume it's nylon or PET unless they tell you otherwise. "Silk-like" and "silken" usually mean petroleum-derived plastic, despite how natural they sound.

Yes, in a positive way. Paper teabags are usually made from filter paper that contains a small amount of plastic (PVA or epichlorohydrin) for wet-strength, and that paper imparts a slight cardboard-like off-flavor especially in delicate green teas. Soilon mesh is neutral — no flavor of its own, no chemical migration into the cup.

The functional advantage is space. Soilon pyramid bags give the leaves room to expand, which matters more for green tea than most people realize — sencha leaves swell to roughly 5x their dry volume during steeping, and a flat compressed paper bag chokes that expansion. Soilon's pyramid shape and finer mesh mean the tea brews closer to how it would loose-leaf in a kyusu.

Cleanest test: compare the same tea in a paper teabag and a Soilon pyramid. The Soilon version tastes more open, fuller, less papery. The difference is subtle but consistent.

Industrial compost only, realistically. Soilon meets standards for industrial composting (60+°C, controlled humidity, 90+ days), but home compost piles rarely hit those temperatures consistently — you might see partial breakdown after a year, but not full disappearance. The marketing claim "compostable" is technically accurate but easy to misread as "throw it in your backyard pile."

If your municipality has a green-bin / commercial composting program, Soilon teabags can go there. If not, the practical move is to cut the bag open, dump the tea leaves into your home compost or directly onto soil (where they break down quickly and feed the bed), and put the empty Soilon mesh in regular trash. The leaves are 95% of the volume and 100% of the nutrient value anyway.

Compared to nylon and PET teabags — which never decompose — Soilon is still a meaningful environmental upgrade even if you can't compost it at home. Just don't let the "compostable" label fool you into thinking it'll vanish in your kitchen pile.

In an industrial composter, Soilon breaks down in roughly 90–180 days — fast for a polymer. For comparison, nylon teabag mesh takes hundreds of years to break down (basically the same as plastic film), and conventional PET teabags are similar. Even "silk" teabags marketed as natural are usually petroleum-based and don't biodegrade meaningfully.

Paper teabags break down faster (60–90 days in compost) but, as mentioned, contain small amounts of plastic in the heat-seal seam. So they're better than nylon but worse than Soilon in net environmental terms.

If you want a fully zero-plastic option, loose-leaf in a kyusu or a reusable cotton tea sock is the only path that's truly free of polymer. Among teabag formats, Soilon is the cleanest choice currently on the market.

Yes — every JPCo teabag uses Soilon mesh. Our Gokuzyo Aracha 50-bag pack and the rest of our teabag lineup are all PLA-based pyramid bags, no nylon or PET in the chain. We made the switch when the microplastic research came out and haven't looked back.

Outside of JPCo, brands that use Soilon (or equivalent PLA mesh) include Tealyra, several premium Japanese exporters like Ippodo and Maeda-en, some American brands like Numi (their pyramid line), and most modern-built specialty tea companies launching after 2018. Older, mass-market brands often still use nylon — Lipton, Tetley, and Twinings pyramid bags are typically PET or nylon unless explicitly labeled otherwise.

If you're at a grocery store and not sure, the package will say "plant-based mesh," "PLA mesh," or "Soilon" if it's the good kind. "Silken" almost always means petroleum-based; assume the worst until the label says otherwise.