Cuppy · Insulated Travel Drinkware
CUPKIN Stainless Steel Insulated Tumbler with Lid and Straw
Lower concern. Stainless steel core is inherently PFAS-free.
Stainless steel tumblers carry minimal PFAS risk from the container itself. Lid and straw materials are typical plastics; no data on PFAS content, but this category rarely discloses or treats these components with fluorochemicals.
Shop Cuppy on Amazon →Material
stainless steel body, standard plastic lid and straw
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 CUPKIN tumbler uses a stainless steel double-wall body, which is chemically inert and does not leach metals or break down with normal use. The lid and straw are standard food-grade plastic (likely polypropylene or acrylic), which are stable at room temperature and warm beverages but can degrade if exposed to high heat or left in direct sunlight for extended periods. Stainless steel is the safest choice for beverage containers because it does not interact with acidic or basic liquids.
The brand's record and disclosure
Cuppy has not publicly disclosed detailed material sourcing, manufacturing certifications (such as FDA food-contact compliance), or commitments to chemical safety standards. The brand's silence on PFAS and other hazard testing is typical of smaller housewares manufacturers, though it does not indicate a problem. No recalls or safety controversies for this product line are on record.
How it compares in its category
Stainless steel tumblers are among the safest reusable beverage containers available, outperforming plastic-only bottles and competing with glass on durability. Most insulated tumblers in this price range use similar plastic lids and straws, so CUPKIN is unremarkable in that respect. The lack of coating means no risk of ceramic-glaze or nonstick-layer degradation, a common concern with some branded competitors.
If you buy it
Avoid filling with boiling liquids or exposing the lid/straw to direct heat sources; use with cold or warm (not hot) beverages to minimize plastic stress. Hand wash the lid and straw rather than dishwashing, as heat cycles may accelerate degradation. Replace the straw and lid if cracking, discoloration, or plastic smell appears. The stainless steel body is durable and safe for years of use.
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 and straw degradation under heat
Standard food-grade plastics (likely PP or acrylic) used in lids and straws are stable at warm-beverage temperatures but may leach small amounts of monomers if repeatedly exposed to hot liquids or high dishwasher cycles. Risk is low with proper use.
BPA or phthalate presence in plastic components
No reports or test data exist for CUPKIN's lid and straw plastic composition. Modern food-contact plastics are typically BPA-free, but the brand does not publicly confirm material specifications. Risk is considered standard for the category unless adverse data emerges.
Stainless steel alloy composition and nickel leaching
Stainless steel is inherently safe for food contact and does not leach metals into beverages under normal use. Nickel levels in food-grade stainless steel are negligible and regulated. No brand-specific testing or concerns are recorded.
Lid seal material and mold/bacterial growth if not dried
Seals and crevices in the lid can trap moisture; if the tumbler is not fully dried between uses or stored with the lid on while damp, mold or bacteria may grow. This is a use-and-maintenance issue, not a material defect.
Coating or adhesive outgassing during production or storage
Stainless steel tumblers with plastic lids may have minor plastic or rubber odors when new, which dissipate quickly with washing and airing. No volatile organic compound (VOC) emissions or adhesive-leach issues are documented for this brand.
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.
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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.