Ello · Insulated Drink Tumblers
Ello Leakproof Oasis Go+ Tumbler
No coating described, and no PFAS statement from the brand.
The product information we reviewed describes double-wall plastic tumbler with leakproof seal, with no water-repellent coating named. Water resistance on products like this usually comes from the material and its seals rather than a surface treatment. The brand has published no PFAS statement for it.
The better-graded swap
Stainless Steel Vacuum Insulated Travel Mug
80/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Double-wall plastic tumbler with leakproof seal
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What Ello Leakproof Oasis Go+ Tumbler is made of, ingredients and materials
The Ello Oasis Go+ is constructed from double-wall plastic (likely polypropylene or similar food-grade resin) with an internal leakproof seal mechanism, typically elastomer or silicone-based. Double-wall construction provides insulation without metal components, eliminating risks from aluminum leaching or metal corrosion. No ceramic, enamel, or Teflon-type coating coatings are documented, which removes exposure pathways for lead, cadmium, or Teflon-type coating fume release during normal use.
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.
Phthalates
Leakproof seals commonly use rubber or silicone; if silicone, risk is minimal. If elastomer-based, phthalate plasticizers are possible but not confirmed for this specific model. Seals are non-food-contact (they sit at the lid closure), limiting direct exposure to beverages.
Source, ATSDR ↗Microplastics
Double-wall plastic construction has no external coating, but interior surfaces may shed microscopic particles if abraded (e.g., aggressive scrubbing, dishwasher stress over years). Risk increases with age and mechanical wear; this is not unique to Ello and applies to all plastic tumblers.
Source, EPA ↗Bacterial or mold growth in seal cavity
Leakproof mechanisms create tight crevices where moisture can trap. If seals are not disassembled and dried fully between uses, biofilm and mold can develop. This is a maintenance issue, not a material defect, but common to all insulated drink tumblers.
Degradation of seal elasticity over time
Consumer reports (non-official) indicate that Ello tumbler seals can lose elasticity and fail to seal after 12-24 months of frequent use, though this is typical wear, not a material safety hazard. Replacement seals are often available separately.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
BPA & bisphenols
Ello does not advertise BPA-free certification for this model; however, most modern food-grade polypropylene used in US consumer tumblers is BPA/BPS-free by default industry practice. No recalls or test failures are on record for this product.
Source, FDA ↗The full breakdown
The brand's record and disclosure
Ello (owned by Corkcicle) does not publish dedicated PFAS transparency statements or third-party certifications (e.g., NSF, GreenGuard) for this product line. The brand has not faced major safety recalls tied to this tumbler model as of available public records. Lack of proactive disclosure does not indicate presence of PFAS, only absence of committal to test or exclude it.
How it compares in its category
The Oasis Go+ sits in the middle-market insulated tumbler segment, comparable to Contigo and Hydro Flask in material approach. Unlike metal-lined tumblers, it avoids potential aluminum-interior corrosion risks. Its plastic-only construction is less premium than stainless steel alternatives but offers lower leaching risk from coatings and simpler recyclability considerations.
If you buy it
Wash the leakproof seal and interior regularly to prevent mold or bacterial biofilm buildup in damp crevices, particularly if left with residual liquid. Do not fill with boiling water; most plastic tumblers are rated for hot (not boiling) liquids, typically up to 140-160 degrees F. Replace the seal if it cracks or loses elasticity, as this compromises the leakproof function and may allow direct contact between liquid and plastic surfaces. Avoid prolonged storage of acidic beverages (citrus, vinegar) as these can stress plastic over time.
What we don’t know
- Basis
- Model estimate, 62% 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.
Better-graded alternatives in Insulated Drink Tumblers
Klean Kanteen
20oz TKWide with Café Cap, Tofu
- Stainless steel bottle, stainless steel cap
- The brand calls it PFAS-free, which we have not verified
- Powder-coat cap degradation over time
3 hazards checked on this product. See all of them.
Klean Kanteen
16oz Rise Tumbler
- Stainless steel body, powder-coat finish
- The brand calls it PFAS-free, which we have not verified
- Powder-coat finish degradation
3 hazards checked on this product. See all of them.
Klean Kanteen
Insulated TKWide Cap
- Stainless steel bottle, plastic cap and silicone gasket
- The brand calls it PFAS-free, which we have not verified
- 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.