Reduce · Insulated Drink Tumblers
REDUCE Chiller Vacuum Insulated 40 oz Tumbler
Lower concern. Vacuum insulated tumblers pose minimal PFAS risk.
REDUCE Chiller uses stainless steel construction, an inherently PFAS-free material. No coatings, nonstick surfaces, or water-resistant treatments typical of PFAS products. Brand makes no PFAS claims but product design itself carries lower concern.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel double-wall vacuum insulation
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 REDUCE Chiller is constructed from 18/8 food-grade stainless steel (outer and inner walls) with a vacuum-sealed air gap for insulation, eliminating the need for foam or chemical insulants. Stainless steel is inert in contact with beverages and foods across normal temperature ranges, meaning no metal leaching into drinks even with acidic or hot liquids. The double-wall design means only stainless steel contacts your beverage; there are no plastic liners, coatings, or adhesives in the liquid-contact zone to degrade or off-gas.
The brand's record and disclosure
REDUCE has not made public statements about PFAS testing or manufacturing practices, and no independent recalls or safety controversies are documented for this product line. The brand does not appear to have third-party certifications (e.g., NSF, FDA material compliance statements) prominently advertised, limiting verification of claims. Absence of disclosure is neutral rather than a red flag for a simple stainless steel product, as vacuum tumblers inherently pose minimal chemical hazard.
How it compares in its category
Stainless steel vacuum tumblers are among the safest reusable beverage containers available, avoiding risks present in plastic alternatives (BPA, phthalates) and coated ceramic options (glaze heavy metals). Most competitors in this category (Hydro Flask, YETI, S'well) use identical 18/8 stainless construction, so REDUCE is chemically equivalent on the material front. Differentiation is ergonomics and brand reputation rather than safety profile.
If you buy it
Hand wash or use gentle cycles; dishwasher-safe claims are standard for stainless steel but repeated heat cycling does not compromise the material chemically. Avoid prolonged storage of acidic beverages (lemon water, sports drinks) at room temperature for weeks, as stainless steel can develop surface pitting under extreme conditions, though this is aesthetic not toxic. The vacuum seal may degrade over years of heavy use, reducing insulation but not creating safety risk. Replace if the lid or gasket crack, as moisture entering the vacuum space can cause mold or corrosion.
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.”
Metal leaching from stainless steel
18/8 stainless steel is chemically passive and does not leach nickel, chromium, or iron into beverages under normal use conditions (room temperature to hot, neutral to mildly acidic). No documented cases of health effects from REDUCE or competitor stainless tumblers.
Coating or lining degradation
This product has no internal coating, enamel, or epoxy lining; the vacuum is created between bare stainless walls. No coating failure mechanism exists for the liquid-contact surface.
Gasket/seal leachables (elastomer)
The lid gasket is typically silicone or rubber; while food-grade silicone is considered inert, the specific composition and sourcing of REDUCE's gasket are not disclosed. Risk is minimal for occasional contact but not zero if gasket material is degraded or non-food-grade.
Mold or bacterial growth in vacuum space
If the vacuum seal fails and moisture enters the insulation layer, mold can grow in the trapped space, though it does not contact the beverage. This is a maintenance issue, not an inherent material hazard.
Thermal safety at temperature extremes
Stainless steel does not off-gas or break down at boiling temperatures or when frozen. The 40 oz size and high insulation may retain extreme heat for extended periods; burns from the outer surface are possible if used carelessly with very hot liquids.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 78% 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.