Is Owala Non-Toxic? The Body Is Fine — the Answer Is in the Lid

MicroPlastics Research DeskEditorial team

August 16, 2026

11 min read

Last reviewed: August 16, 2026 by the MicroPlastics Research Desk. Submit a correction or see our editorial standards.

Quick Answer

Yes on the things people worry about, and the interesting answer is somewhere nobody looks. An insulated Owala body is triple-layer vacuum-insulated stainless steel — inert, sheds nothing, and not a microplastics question at all. It is BPA- and phthalate-free, and that claim is real rather than a substitution, because the plastic parts are Tritan copolyester, which contains no bisphenol in its chemistry to begin with. So where does that leave the worry? Entirely in the lid. The FreeSip lid is two different plastics — a Tritan drinking spout and a polypropylene flip mechanism — and when researchers actually counted particles from reusable bottles, the source was not the body. It was the cap: 131 ± 25 particles per litre after one opening, rising to 242 ± 64 after eleven. You bought a steel bottle to avoid plastic. The plastic that matters is the part you open forty times a day.

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Is Owala non-toxic: the stainless steel body is inert, and the exposure question is the lid assembly of Tritan spout and polypropylene flip mechanism

Key Takeaways

The insulated body is stainless steel — triple-layer, vacuum-insulated, inert. It does not shed microplastics.
BPA-free here is genuine, not a swap. The plastic parts are Tritan copolyester, which contains no bisphenol of any kind — unlike plastics that replaced BPA with BPS.
The lid is two plastics, not one. A Tritan spout and a polypropylene flip mechanism, and they behave very differently.
Polypropylene is the higher-shedding of the two, and release rises sharply with heat — from roughly 2×10⁵ to 3×10⁷ particles per litre between 25 and 100 °C in PP bottles.
Opening the bottle is an abrasion cycle. Measured release from reusable-bottle cap systems went 131 → 242 particles/litre between one opening and eleven.
There is a fully plastic version. The Tritan FreeSip has a Tritan body rather than steel — a different product from the insulated one, and worth knowing which you own.
The highest-value habit is lid care, not bottle replacement: hand-wash the lid, replace it when the seal degrades, and do not put hot liquid through it.

What an Owala is actually made of

insulated body material: Steelinsulated body materialtriple-layer vacuum-insulated stainless steel — inert, sheds nothing
Owala FreeSip product specifications
the drinking spout: Tritanthe drinking spoutEastman copolyester — no bisphenol in its monomer chemistry, so BPA-free by structure
Owala FreeSip product specifications
the flip mechanism: PPthe flip mechanismpolypropylene — softer, higher-shedding, and the part under mechanical load
Owala FreeSip product specifications
particles/litre from a cap system: 131 → 242particles/litre from a cap system± 25 after one opening, ± 64 after eleven openings and closings
Winkler et al., ACS ES&T Water, 2020

The short answer, and why it is not the whole answer

“Is Owala non-toxic” almost always means one of three things: does it contain BPA, does it leach chemicals, and does it shed microplastics. The first two have clean answers.

Owala states its bottles are BPA- and phthalate-free, and unusually that claim survives scrutiny. Many products earned “BPA-free” by substituting bisphenol S or F — close structural cousins with related endocrine concerns. Owala’s plastic parts are Eastman Tritan copolyester, built from three monomers (DMT, CHDM and TMCD), none of which is a bisphenol. There was nothing to substitute. See what Tritan actually is for the full chemistry and the litigation history behind it.

The third question is where it gets interesting, because the honest answer is not about the bottle at all.

An Owala is three materials, and only one of them matters

Owala FreeSip components by material and shedding behaviour (checked August 2026)
Component	Material	Sheds?	Why
Insulated body	Stainless steel, triple-layer vacuum	No	Inert metal — not a polymer, nothing to fragment
Drinking spout	Tritan copolyester	Low	Heat-stable to ~120 °C; the better-behaved of the two plastics
Flip mechanism / threads	Polypropylene	Yes	Softer, under repeated mechanical load, and heat-sensitive
Seal / gasket	Silicone	Minimal	Siloxane, not a carbon-chain plastic — degrades visibly before it sheds meaningfully
Tritan FreeSip body	Tritan copolyester	Low	The non-insulated model — a plastic bottle, not a steel one

Read that table and the popular framing inverts. People buy a steel Owala specifically to get away from plastic, then drink through a plastic spout attached to a plastic mechanism forty times a day. The body — the part that gets all the attention, and all the marketing — is the one part that was never the question.

Which Owala do you actually own?

This trips people up, because the range contains two fundamentally different products under similar names. The insulated FreeSip has a stainless steel body. The Tritan FreeSip is plastic all the way through. Both are marketed on the same BPA-free claim, and both are reasonable, but they are not the same object from a microplastics point of view.

A quick test: an insulated bottle is heavy for its size, does not sweat with cold liquid inside, and is opaque. A Tritan bottle is light, usually translucent, and cold to the touch when full. If you can see the water level through the wall, you own the plastic one.

For a model-by-model comparison across the range, see the best Owala water bottles for microplastics, which covers FreeSip, Twist and the tumblers. This page is about whether the one already on your desk is a problem.

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What actually changes your exposure

Hand-wash the lid, even if you dishwasher the body. A dishwasher applies heat, moisture and mechanical stress at once, and the lid is the assembly with the moving plastic parts. The steel body does not care either way.
Replace the lid, not the bottle. Owala sells replacement lids. When the seal stiffens or the flip loosens, the mechanism is worn — and worn plastic is shedding plastic. This is far cheaper than replacing a bottle you did not need to replace.
Do not put hot liquid through the spout. Heat is the single biggest driver of release in polypropylene, and the flip mechanism is the PP part. Coffee belongs in something without a plastic drink-through.
Do not leave it in a hot car. The steel body is indifferent; the lid assembly is not. See what happens to a bottle in a hot car.
Retire any lid with visible scratching or cloudiness. Surface damage on the drinking path is fragmentation already underway.
If you want the plastic gone entirely, the lid is the constraint, not the brand. Essentially every leakproof bottle on the market uses a polymer seal and mechanism, so this is a category limit rather than an Owala fault.

Frequently Asked Questions

Is Owala non-toxic?

On the standard concerns, yes. The insulated bodies are triple-layer vacuum-insulated stainless steel, which is inert and sheds nothing, and the plastic components are BPA- and phthalate-free. That BPA-free claim is stronger than most: the parts are Eastman Tritan copolyester, made from DMT, CHDM and TMCD, none of which is a bisphenol — so unlike many "BPA-free" plastics, nothing was substituted with BPS or BPF. The remaining question is microplastic shedding, and that comes from the lid rather than the bottle.

Do Owala bottles contain BPA?

No. Owala states its bottles are BPA- and phthalate-free, and the plastic used is Tritan copolyester, which has no bisphenol in its monomer chemistry at all. This differs from plastics that achieved a BPA-free label by swapping in bisphenol S or F, which are structurally similar compounds with related endocrine concerns. Polycarbonate, the plastic Tritan replaced in drinkware, is polymerised from BPA itself.

Do Owala bottles shed microplastics?

The steel body does not — it is inert metal. The lid can, because it contains two plastics: a Tritan drinking spout and a polypropylene flip mechanism. Research on reusable bottle cap systems using Raman microspectroscopy found 131 ± 25 microplastic particles per litre after a single opening, rising to 242 ± 64 after eleven openings and closings, with abrasion between threaded plastic surfaces identified as the source. Polypropylene is the softer and higher-shedding of the two materials in the lid.

Is the Owala lid dishwasher safe?

It is rated as dishwasher safe, but hand-washing the lid is the better habit. A dishwasher combines heat, moisture and mechanical stress, and all three drive particle release from plastic — and the lid is the component containing the moving polypropylene parts. The stainless steel body is unaffected either way, so washing them differently is a reasonable compromise.

Is the Tritan Owala as good as the stainless steel one?

They are different products. The insulated FreeSip has a stainless steel body; the Tritan FreeSip is plastic throughout. Tritan is the best-performing of the common drinkware plastics — heat-stable to around 120 °C and free of bisphenols — but it is still a polymer, whereas steel is inert. If avoiding microplastics is the priority, the insulated model removes one source entirely, though both share the same lid question.

Should I replace my Owala or just the lid?

Usually just the lid. The steel body does not degrade in any way that matters for microplastics, while the lid contains the plastic parts under repeated mechanical load — the flip mechanism, the threads and the seal. When the seal stiffens, the flip loosens or the spout shows scratching or cloudiness, the assembly is wearing and replacement lids are sold separately. Replacing the whole bottle is generally unnecessary.

Sources

Owala (2026). FreeSip product specifications — triple-layer vacuum-insulated stainless steel body; Tritan copolyester spout; polypropylene flip mechanism; BPA- and phthalate-free. Owala.
Winkler A, Santo N, Ortenzi MA, Bolzoni E, Bacchetta R, Tremolada P (2020). A preliminary study of microplastic abrasion from the screw cap system of reusable plastic bottles by Raman microspectroscopy (131 ± 25 particles/L after one opening; 242 ± 64 after eleven). ACS ES&T Water.
Osimitz TG, et al. (2012). Lack of androgenicity and estrogenicity of the three monomers used in Eastman’s Tritan copolyesters (DMT, CHDM, TMCD) — study funded by Eastman Chemical Company. Food and Chemical Toxicology 50(6).
ScienceDirect (2025). Multiple characteristics of microplastics generated from polypropylene bottles — release rising from 2×10⁵ to 3×10⁷ particles/L between 25 °C and 100 °C. ScienceDirect.

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