Simple Modern · Insulated Drink Tumblers
Simple Modern Trek Tumbler
Lower concern; stainless steel body minimizes PFAS risk.
Simple Modern's Trek Tumblers use stainless steel, a material with no known PFAS concerns. The brand makes no specific PFAS claims; plastic components present minor residual risk.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Double-wall stainless steel with plastic lid/baseband
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What Simple Modern Trek Tumbler is made of, ingredients and materials
The Trek Tumbler uses double-wall stainless steel (grade unspecified but typically 18/8 or 304) for the beverage chamber, which is chemically inert and does not leach metals into cold or hot liquids. The lid and base band are plastic, likely polypropylene or similar thermoplastic; these contact the mouth and rim but not the beverage itself. Stainless steel is not a material linked to BPA, phthalates, or other common polymer contaminants.
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.
Plastic base band degradation and mouth contact
The plastic base band or rim that contacts the lips/mouth may degrade with repeated thermal cycling and mechanical stress. Degraded plastic can fragment into microplastics or off-gas volatile organics, though risk is low if the product is not microwaved or exposed to boiling water repeatedly. Inspection every 6-12 months is recommended.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
BPA & bisphenols
Simple Modern has not disclosed the specific plastic resin or additives in the lid. Polypropylene (PP) and similar thermoplastics used in food-contact lids are typically BPA-free, but phthalate and other plasticizer use is not ruled out without lab testing or certification. The lid does not contact the beverage directly, only the mouth/lips and the rim.
Source, FDA ↗Stainless steel quality and corrosion
No evidence of nickel leaching, corrosion, or material degradation in this model. High-quality stainless steel (18/8) is resistant to acidic beverages and normal wear. Without specification of the exact steel grade from Simple Modern, a minor risk remains that lower-grade stainless (with higher nickel or impurities) could theoretically corrode under extreme conditions, but this is not documented f
Manufacturing process off-gassing or residues
No recalls or reports of chemical odor, residue, or VOC off-gassing from new Trek Tumblers. Stainless steel manufacturing does not typically introduce volatile contaminants. A brief hand wash before first use is a standard precaution but not specific to a known defect in this brand.
PFAS
PFAS use in tumbler lids is not a known industry practice, and Simple Modern's plastic lid is unlikely to contain intentional PFAS. However, the brand does not certify PFAS-free manufacturing, so residual or incidental contamination cannot be ruled out without third-party testing.
Source, ATSDR ↗The full breakdown
The brand's record and disclosure
Simple Modern does not publicly disclose ingredient or material certifications (FDA approval, third-party testing, PFAS commitment statements). No safety recalls or substantiated product hazard reports are on record for this model. The brand has not taken a public stance on PFAS or other synthetic chemical avoidance, which suggests either a neutral risk profile or passive compliance with baseline regulations rather than proactive material screening.
How it compares in its category
Stainless steel tumblers show lower leaching risk compared to plastic-only or plastic-lined alternatives. The Trek Tumbler is competitive with other mid-range steel bottles (Hydro Flask, S'well, Klean Kanteen) in material safety; most competing products also use plastic lids, so lid composition is roughly equivalent across the category. Price positioning suggests standard manufacturing, not premium sourcing, so material traceability is typical rather than exceptional.
If you buy it
Wash the plastic lid by hand before first use and periodically (dishwasher safe according to brand, but hand washing extends plastic life). Do not microwave or apply extreme heat to the plastic components; the lid's usable temperature range is typically 40-80 degrees Celsius. Replace the lid if it becomes visibly cloudy, cracked, or develops odor, as plastic degrades over time with repeated thermal cycling. Avoid prolonged contact with acidic beverages at high temperatures, as any microscopic seams between stainless and plastic could theoretically trap corrosive liquids.
What we don’t know
- Basis
- Model estimate, 72% 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.