Ello · Insulated Drink Tumblers
Ello Oasis Tumbler
Lower concern. Tritan copolyester plastic is not a material linked to PFAS.
Ello Oasis Tumbler is made of Tritan copolyester plastic, not a material linked to PFAS. The brand has no PFAS statement on record.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Tritan copolyester plastic
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What Ello Oasis Tumbler is made of, ingredients and materials
The Ello Oasis uses Tritan copolyester, a third-generation plastic engineered to replace polycarbonate without BPA or BPS. Tritan is chemically stable across typical use temperatures (cold to warm beverages, dishwasher safe) and does not readily leach endocrine disruptors under normal conditions. The material is transparent, durable, and does not degrade into microplastics at the temperatures users typically encounter with drinkware.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Microplastic shedding from wear
Repeated washing, scratching, and UV exposure can generate microscopic plastic particles over years of use, though this is an aging issue common to all plastic drinkware rather than a manufacturing defect.
Heat stability margin
Tritan's glass transition temperature is around 105°C; prolonged exposure to boiling water or hot dishwasher cycles can stress the material and increase microscopic leaching, though well below levels of concern at typical beverage temperatures.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
BPA & bisphenols
Tritan copolyester is formulated specifically to exclude BPA and BPS; no documented leaching events have been reported for Ello Oasis tumblers under normal use.
Source, FDA ↗Phthalates
Tritan does not typically require phthalate plasticizers; Ello has not disclosed phthalate-containing additives and none are known to be present in commercial Tritan formulations used for drinkware.
Source, ATSDR ↗Coating or lid material hazards
Ello Oasis typically features a silicone or plastic lid; no recalls or reported hazards linked to lid material have been identified, though lid seals should be inspected for mold/bacterial growth if stored wet.
The full breakdown
The brand's record and disclosure
Ello (owned by Corkcicle) markets its products as BPA-free and has maintained this commitment across its drinkware line without documented violations or major recalls specific to chemical safety. The brand does not publicly disclose Tritan sourcing or third-party testing results, reflecting industry-standard opacity rather than a red flag. No established controversies regarding leaching, off-gassing, or hidden ingredient contamination have been reported for Ello tumblers.
How it compares in its category
Tritan copolyester tumblers like the Oasis have lower concern than older polycarbonate or generic BPA-containing resins, but glass or stainless steel show lower concern for leaching risk. Most competitor brands (Contigo, Hydro Flask insulated variants, S'well) use either Tritan, borosilicate glass, or stainless steel construction, placing Ello in a low-risk peer group. The main trade-off is durability and scratch resistance; Tritan can cloud or scratch with heavy use.
If you buy it
Avoid prolonged exposure to very hot liquids (above 50-60°C / 120-140°F), as Tritan's stability margin narrows at sustained high temperatures. Wash by hand if possible to reduce scratching; clouding does not indicate chemical failure but reduces clarity. Replace if visible cracks develop, as micro-fractures can harbor bacteria. Do not microwave; use only as intended for cold to warm beverages.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Ello has made none
Formulations change between production runs, so check the current label. How we grade.
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Klean Kanteen
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- Silicone gasket degradation and leaching
3 hazards checked on this product. See all of them.
More insulated drink tumblers grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.