Ello · Insulated Drink Tumblers
Ello Oasis Go 24oz Stainless Steel Tumbler
Stainless steel tumbler, lower PFAS risk concern.
Ello Oasis Go is a bare stainless steel tumbler with no reported special coatings or treatments. No brand PFAS disclosure found, but material itself poses lower risk.
We flunk more products than we pass. This one earned its grade. How we grade
Material
stainless steel tumbler, no reported coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
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 Go 24oz is a double-wall stainless steel tumbler with no ceramic, enamel, or polymer coating on the interior contact surface. Stainless steel (typically 18/8 or 18/10 alloy) does not leach lead, cadmium, or other heavy metals into beverages under normal use. The material is inert, food-grade, and does not degrade with hot or acidic liquids, making it chemically one of the safest tumbler options available.
The brand's record and disclosure
Ello is a subsidiary of Zojirushi and markets products as BPA-free and designed for safe beverage storage. The company does not publicly disclose PFAS use or restrictions on its website or product documentation. No safety recalls or contamination incidents have been reported for the Oasis Go line. No third-party certifications (NSF, BPA-free verification) are prominently claimed, though the product meets FDA food-contact standards as a stainless steel vessel.
How it compares in its category
This tumbler avoids hazards common to ceramic-coated, enamel-lined, or plastic-lined alternatives, which may contain lead glazes, microplastics, or BPA degradation pathways. Compared to plastic tumblers, stainless steel eliminates leaching risk entirely. It is comparable in safety to other bare stainless steel tumblers (e.g., Hydro Flask, Contigo) and carries no material disadvantage in this category.
If you buy it
Hand-wash or use gentle machine cycles to preserve the exterior finish; avoid harsh abrasives that could scratch the steel (though this poses no safety risk). The vacuum seal and lid gasket are the wear points; replace the lid or seal if cracking or loss of insulation occurs. No special handling required for hot or cold beverages. Stainless steel is durable long-term; this product typically requires replacement only due to lid failure, not material degradation.
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.”
Coating degradation or leaching
No coating is present on the interior contact surface. The stainless steel itself does not degrade or leach under normal beverage use (hot, cold, acidic, or alkaline liquids).
Heavy metals (lead, cadmium) in glazes or enamels
Stainless steel tumbler has no ceramic, enamel, or decorative glaze on the beverage-contact surface. No lead or cadmium exposure pathway exists.
Microplastics or polymer leaching
The interior is solid stainless steel. No plastic liners, BPA, or phthalates are in contact with beverages. The lid gasket is a potential source only if severely degraded; replacement eliminates this.
Lid or seal material off-gassing or leaching
The lid gasket and seal materials are not fully disclosed by Ello. If composed of silicone or plastic, minor off-gassing is theoretically possible but unlikely at room temperature and not reported. Inspect for visible cracks or discoloration as a replacement trigger.
Bacterial growth in double-wall space
The Oasis Go is a sealed double-wall design; the inner cavity is not accessible for contamination or bacterial colonization under normal use. Proper care (avoiding damage to the double-wall seal) prevents this risk.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 78% 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 Drink Tumblers
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✓Naturally PFAS-free material
Cuppa
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Klean Kanteen
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Lower PFAS concern. Bare stainless steel container, no coatings.
✓Bare metal or glass, no coating at all
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.