Ninja · Insulated Travel Mugs
Ninja 26oz BlendBOSS Travel Tumbler
Lower concern tumbler. Stainless steel core is PFAS-free; lid material unverified.
Ninja's travel tumbler uses stainless steel, a PFAS-free base material. Plastic lid composition is undisclosed but typical consumer tumblers rarely contain PFAS in lids; no brand claims made.
Shop Ninja on Amazon →Material
Stainless steel with plastic lid
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 Ninja BlendBOSS Travel Tumbler uses a stainless steel interior and body, which is chemically inert and will not leach metals or BPA into beverages under normal conditions. The lid is plastic (material type not specified by Ninja), which introduces potential exposure if the lid contacts hot liquids or if the plastic degrades over time. Stainless steel is one of the safest material choices for beverage containers because it resists corrosion and does not interact with acidic or hot contents the way aluminum or unlined steel would.
The brand's record and disclosure
Ninja (SharkNinja Operating LLC) does not publicly disclose materials testing results, PFAS status, or third-party certifications for this tumbler. The company has not issued transparency reports on chemical composition or manufacturing standards specific to drinkware. No established safety recalls or investigations involving this exact model have been reported in public databases. The silent stance on PFAS and material sourcing limits independent verification of supply chain safety.
How it compares in its category
Travel tumblers with stainless steel cores are standard in the mid-range market and generally rank lower-risk than plastic-only bottles or aluminum with epoxy linings. This product sits in a safer category than tumblers with ceramic coatings (cadmium risk) or older Teflon-type coating-based insulation. Most competitors in this price range offer similarly vague material disclosures, making Ninja's approach typical rather than exceptional or concerning.
If you buy it
Avoid putting boiling water or acidic beverages directly against the plastic lid for extended periods; use it primarily as a holder for cooler or room-temperature drinks, or fill with hot liquid and secure the lid loosely. Inspect the lid seal regularly for cracks or discoloration, which indicate plastic degradation. Replace the lid if visible wear appears, as small particles could migrate into liquid over time. Hand-wash rather than dishwasher to minimize repeated thermal stress on the plastic components.
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.”
Plastic lid composition and leaching
Ninja does not specify the plastic type (polypropylene, acrylic, or other). Unidentified plastics may contain BPA, BPS, or phthalates if sourced from regions with less stringent standards. Risk is lower if lid contact with liquid is minimal and tumbler is used for cool to warm (not hot) beverages.
Lid seal degradation over time
Plastic lids on stainless steel tumblers are subject to repeated thermal cycling and mechanical stress. Degradation can release microplastics or allow growth of bacteria in crevices; no published data specific to BlendBOSS durability exists.
Stainless steel leaching
Stainless steel itself (typically 18/10 grade in commercial drinkware) does not leach iron, nickel, or chromium into beverages at detectable levels under normal use. No concerns are established for this material class.
Manufacturing contaminants or residues
Ninja does not disclose cleaning or post-manufacturing testing protocols. No recalls or complaints specific to residual contamination have been reported; risk is general to the brand's quality control rather than unique to this model.
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 Travel Mugs
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Thermos
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stainless steel, no stated interior coating
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More insulated travel mugs 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.