Simple Modern · Insulated Drink Tumblers
Signature Classic Tumbler
Low concern. Stainless steel tumbler unlikely to contain PFAS.
Double-wall stainless steel construction contains no known Teflon-family coating coatings or water-repellent finishes. This standard build creates minimal PFAS risk for holding beverages.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Double-wall stainless steel
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What Signature Classic Tumbler is made of, ingredients and materials
The Signature Classic Tumbler uses food-grade 18/8 stainless steel (304 grade) as the inner and outer walls, with a vacuum seal between them for insulation. Stainless steel is chemically inert at normal use temperatures and does not leach metals into beverages under ordinary conditions. The lid is typically plastic (polypropylene or silicone); these materials are FDA-approved for food contact but should not be subjected to extreme heat or prolonged contact with hot liquids above 160-180F. No problematic coatings, glazes, or non-stick surfaces are present to degrade or release particles over time.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Bacterial growth in vacuum seal
If the tumbler is not dried thoroughly after washing or left with liquid sitting for extended periods, moisture trapped in the insulation layer or around the seal may support bacterial or mold growth. This is a design limitation common to all vacuum-sealed drinkware, not specific to Simple Modern.
Lid material degradation over time
User reports exist of silicone or plastic lids becoming discolored, developing odor, or becoming brittle after 1-3 years of regular use. This is cosmetic and functional degradation rather than a chemical safety hazard, but signals when replacement is warranted.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Plastic lid leaching (polypropylene/silicone)
FDA-approved plastics used in lids do not leach BPA or phthalates under normal beverage temperatures. Risk exists only if lid is repeatedly heated above 160F or subjected to aggressive cleaning agents, neither of which is typical for tumbler use.
Metal leaching from stainless steel
304-grade stainless steel (standard in food tumblers) does not leach nickel, chromium, or other metals into beverages at neutral pH. Acidic beverages (vinegar, citrus) pose theoretical but not established practical risk over short contact times typical of drinking.
Aluminum leaching (if present in assembly)
The Signature Classic uses stainless steel throughout; no aluminum is used in the main body. If any aluminum adhesive or fasteners are present (unlikely), contact with beverages would be minimal due to the sealed design.
The full breakdown
The brand's record and disclosure
Simple Modern has maintained a low public profile on material safety testing and transparency; no major product recalls or contamination incidents are documented in available safety databases. The brand does not prominently advertise third-party certifications (e.g., BPA-free, lead-free testing) on marketing materials, though stainless steel inherently does not contain these concerns. No established controversies regarding manufacturing practices or chemical safety have been reported by independent safety organizations or consumer watchdogs.
How it compares in its category
Double-wall stainless steel tumblers show lower concern for the coating-degradation risks associated with ceramic or coated metal cups, and this material is not linked to PFAS concerns that affect some plastic drinkware options. Simple Modern's design is typical for this category; competitors like Hydro Flask and YETI use identical base material and construction. The main differentiator is lid design and plastic component quality, which varies by model but poses no unique hazard for this product line relative to peers.
If you buy it
Wash the tumbler by hand or on the top rack of a dishwasher; avoid prolonged boiling or steam exposure of the lid to prevent plastic degradation. Do not fill with liquids hotter than 180F immediately; let very hot beverages cool slightly before capping to reduce pressure buildup and plastic stress. Replace the lid if it becomes visibly cracked, discolored, or develops an odor, as this signals material breakdown. The stainless steel body itself will last indefinitely with normal use and does not require replacement unless dented beyond repair.
What we don’t know
- Basis
- Model estimate, 82% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Simple Modern 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.