Ello · Insulated Drinkware Tumblers
Ello Oasis Tumbler
Lower concern. Tritan is inherently PFAS-free plastic.
Ello Oasis uses Tritan copolyester, a PFAS-free plastic choice. No brand disclosure on PFAS, but material itself carries lower chemical risk.
Shop Ello on Amazon →Material
Tritan copolyester plastic
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
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.
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 sit at the safer end of plastic drinkware compared to older polycarbonate or generic BPA-containing resins, but slightly behind glass or stainless steel in absolute inertness. 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.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
BPA/BPS leaching
Tritan copolyester is formulated specifically to exclude BPA and BPS; no documented leaching events have been reported for Ello Oasis tumblers under normal use.
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.
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.
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.
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 we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Insulated Drinkware Tumblers
Contigo
Byron 2.0 Stainless Steel Travel Mug Snapseal
Stainless steel, silicone gasket
Travel mug with lower PFAS concern; stainless steel typically safe.
✓Bare metal or glass, no coating at all
Thermos
Stainless King Travel Tumbler
Stainless steel exterior, vacuum-insulated, minimal internal coating
Lower concern. Stainless steel tumbler with standard design, no PFAS-prone features.
✓Bare metal or glass, no coating at all
Thermos
Stainless Steel Tumbler w/ Slide Lock Lid
Stainless steel tumbler with plastic slide lock lid
Lower concern. Stainless steel is PFAS-free; monitor lid material.
✓Bare metal or glass, no coating at all
More insulated drinkware 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.