Reduce · Insulated Drink Tumblers
Reduce 16oz Perk Insulated Stainless Steel Leak Proof Coffee Tumbler
Skip until Reduce discloses lid and seal coating materials.
Stainless steel tumbler likely uses polymer seals and coatings on lid for leak-proof function; composition not disclosed. Reduce silent on PFAS, making assessment difficult.
The safe swap
Reduce
Reduce Halo Tumbler
100/100 safety
Same rubric that flunked this product. The swap earned its A.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Stainless steel with lid coating, leak-proof treatment unspecified
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used 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 tumbler body is stainless steel (typically 18/8 or 304 grade), which does not leach metals into beverages under normal use and resists corrosion. The lid, seals, and any internal or external coatings are not specified by Reduce in public materials. Leak-proof treatments often involve silicone gaskets and proprietary polymer coatings on the lid or sealing surfaces, which may contain PFAS (fluorinated compounds for water and stain resistance) or other polymers with unknown composition. Without disclosure, the safety of these hidden components cannot be fully assessed.
The brand's record and disclosure
Reduce does not publicly disclose material composition of lids, gaskets, or coatings on its product pages or sustainability statements reviewed in available sources. The brand has not publicly committed to PFAS elimination or third-party safety testing for this category. No major recalls or safety controversies are on record for Reduce insulated tumblers, but the absence of transparency on components is a red flag for conscientious buyers. Competitors in this space (Hydro Flask, S'well, YETI) vary in transparency, with some providing partial material lists.
How it compares in its category
Double-wall insulated stainless steel tumblers are generally safe if materials are disclosed. Reduce's lack of transparency puts it behind brands that explicitly state their lids and gaskets are PFAS-free or list polymer types. Many competitors still use silicone gaskets and proprietary coatings without disclosure, so Reduce is not uniquely opaque, but it is not a leader in safety communication. Glass-lined or ceramic-lined alternatives exist but carry fragility and thermal shock risks that stainless steel avoids.
If you buy it
Avoid prolonged contact with very hot liquids (above 185F / 85C) immediately after filling, as heat can accelerate leaching from coatings. Clean the lid and gasket by hand with mild soap and warm water; do not soak lids for extended periods or use abrasive scrubbers that could degrade coatings. Replace gaskets or lids every 2-3 years if they show wear, discoloration, or loss of seal integrity, as degraded materials are more likely to shed particles. Contact Reduce's customer service and request a material safety data sheet or PFAS statement before purchase if you have specific chemical sensitivities.
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 gasket composition (undisclosed polymers/coatings)
Leak-proof lids typically use silicone gaskets and proprietary polymer coatings for water repellency. Reduce does not specify the composition of these components, leaving open the possibility of PFAS, phthalates, or other plastic additives in contact with hot beverages. Without disclosure, risk level cannot be ruled down.
Stainless steel body leaching
Food-grade stainless steel (18/8 or 304) does not release iron, nickel, or chromium into beverages under normal temperature and pH conditions. No concerns are documented for this material in insulated tumblers.
Thermal degradation of coatings
Repeated exposure to boiling or near-boiling liquids can degrade polymeric coatings and gaskets over time, potentially releasing monomers or additives. The lack of thermal-safety specifications from Reduce prevents assessment of design limits.
Bacterial growth in seal channels
Double-wall tumbler designs with non-removable lids can trap moisture and debris in gasket channels if not thoroughly cleaned. Leak-proof designs may make disassembly difficult, increasing risk of microbial colonization over months of use.
Label migration from external decals or printing
If the tumbler features printed logos or decals in contact with skin or lips, inks and adhesives could migrate in rare cases, but no specific issues are documented for Reduce products in this class.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 42% 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
Reduce
Halo Tumbler
Stainless steel and plastic lid
Lower concern tumbler; stainless steel is inherently PFAS-safe.
✓Naturally PFAS-free material
Cuppa
To Go Tumbler
Stainless steel with plastic lid
Lower concern. Standard tumbler with no known PFAS risks.
✓Naturally PFAS-free material
Klean Kanteen
Steel Pint
18/8 stainless steel, bare metal
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.