Ello · Insulated Drink Tumblers
Ello Port 40 oz Stainless Steel Tumbler with Handle
Lower concern. Bare stainless steel has minimal PFAS risk.
Ello Port tumblers are stainless steel with no reported coating or treatment. This material carries lower PFAS concern than coated drinkware.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel tumbler with handle
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 Port 40 oz is primarily 18/8 stainless steel (also called 304-grade), which is food-contact safe and highly resistant to corrosion and leaching. Stainless steel does not degrade into the liquid the way ceramics, plastics, or non-stick coatings can. The handle is likely rubber or silicone, materials that are inert at room temperature and standard beverage temperatures. The lid mechanism and any interior seals may include small plastic or silicone components, but the main contact surface with liquids remains metal.
The brand's record and disclosure
Ello is a subsidiary brand under the same parent company as Contigo and other drinkware lines. The brand has not published detailed material disclosures or third-party safety certifications (e.g., NSF, BPA-free claims) in widely accessible formats. No significant safety recalls or contamination incidents for this product line are documented in public databases. The brand's silence on PFAS and chemical testing reflects a broader pattern in the drinkware category of minimal proactive transparency.
How it compares in its category
Stainless steel tumblers are among the safest reusable drink containers available, especially compared to plastic or ceramic alternatives with coatings. They avoid the leaching risks of BPA-lined thermoses or polymer food-storage containers. Many competitors (Hydro Flask, S'well, Yeti) market similar all-stainless construction without significantly more rigorous testing disclosure. Price-wise, the Ello Port sits in the mid-range, suggesting adequate quality control relative to budget alternatives.
If you buy it
Hand-wash the tumbler and lid regularly to prevent bacterial growth in crevices, especially if used for hot drinks or left sitting. Avoid dishwasher cycles if possible, as repeated heating of seals can degrade them over years of use. Do not use for acidic beverages (lemon water, vinegar) for extended periods, as these can slowly etch stainless steel, though this does not create safety hazards. Replace the lid gasket or seal if it becomes visibly cracked or discolored, as this may compromise insulation and hygiene.
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.”
Lid and handle material leaching (silicone/rubber seals)
Silicone and rubber gaskets used in reusable tumblers are generally inert at ambient and warm temperatures. No leaching issues have been documented for Ello Port specifically, and food-grade silicone is the industry standard.
Stainless steel corrosion and metal leaching
While 304-grade stainless steel is highly corrosion-resistant, prolonged contact with acidic beverages (citrus, vinegar) or chlorinated water in very rare cases could theoretically increase nickel or iron leaching. Risk is minimal for typical use but is theoretically present with lower-quality stainless or improper alloy labeling.
Bacterial growth in seals and threads
Reusable tumbler lids and threaded sections can harbor bacteria if not cleaned thoroughly, especially in silicone gaskets. This is a general hygiene issue, not a manufacturing defect specific to Ello, but proper maintenance is required.
Thermal shock cracking (lid or interior coating, if present)
If the interior has any enamel or non-stick coating (less common in budget stainless steel), extreme temperature swings could cause cracking. Ello Port appears to be bare stainless, reducing this risk, but confirm packaging or product specs for any interior coating.
Heavy metal residues in manufacturing (cadmium, lead in plating or welds)
No recalls or documented contamination for Ello Port. Stainless steel manufacturing in certified facilities (which most major drinkware brands use) is regulated to exclude heavy metal additives, though full supply-chain transparency is not guaranteed.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 82% 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
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Klean Kanteen
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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.