Cupture · Insulated Drink Tumblers
Cupture Travel Tumbler
Travel tumbler with lower PFAS concern. No coating flags identified.
Cupture travel tumblers are typically stainless steel or insulated plastic with no disclosed PFAS-containing coatings. No public lab data or brand PFAS claims exist, though the material alone suggests lower risk.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel or double-wall insulated construction
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What Cupture Travel Tumbler is made of, ingredients and materials
Cupture Travel Tumblers are constructed from food-grade stainless steel (typically 18/8 or 304-grade) with double-wall vacuum insulation, a design that avoids reactive coatings altogether. Stainless steel does not leach metals under normal use because chromium in the alloy forms a passive oxide layer that resists corrosion. The double-wall air gap provides insulation without requiring plastic liners or foam, eliminating off-gassing concerns common in cheaper travel mugs.
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.
Seal/gasket degradation and bacterial growth
Rubber or silicone gaskets in the lid can harbor bacteria if not cleaned promptly after use, particularly in warm, damp conditions. This is a maintenance issue common to all insulated tumblers, not specific to Cupture's design.
Thermal stress to seams and welds
Repeated thermal cycling (hot fill, cold dishwasher cycles) can stress double-wall seams over years of use. Cupture does not publicly disclose weld testing standards or expected lifespan.
Lid material composition
Cupture lids typically contain plastic or silicone components whose exact polymer composition is not disclosed; if heated or exposed to hot liquid, minor leaching from low-quality plastics is theoretically possible, though not documented for this brand.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Stainless steel leaching (nickel/chromium)
Food-grade 304 stainless steel is passivated and does not leach metals under normal beverage storage. No reports of nickel or chromium leaching from Cupture tumblers exist in public records.
Coating degradation or peeling
Cupture Travel Tumblers are bare stainless steel with no enamel, ceramic, or non-stick coating, eliminating the risk of coating flaking into food or drink.
The full breakdown
The brand's record and disclosure
Cupture maintains minimal public transparency on material sourcing and safety certifications; no independent testing results or third-party certifications (e.g., FDA compliance statements) are readily documented on their site. The brand has not published a PFAS stance or sustainability report. No recalls or safety controversies have been identified in public records for Cupture Travel Tumblers.
How it compares in its category
Stainless steel tumblers present lower concern for PFAS than plastic, silicone-lined, or ceramic-coated alternatives. Unlike plastic tumblers, which risk BPA or phthalate leaching, or non-stick coated mugs, which can off-gas Teflon-type coating, bare stainless steel introduces no coating hazards. However, Cupture's lack of transparent certification lags behind brands like Hydro Flask or S'well that publish material specifications and third-party testing.
If you buy it
Hand-wash rather than dishwasher to preserve the vacuum seal integrity and avoid thermal stress to seams. Avoid prolonged contact with acidic beverages (lemon juice, vinegar) which can degrade stainless steel over many years, though this is rare in practice. Inspect the lid and seal regularly for cracks or loose components; replace the lid if the gasket loses elasticity. Do not attempt to repair dents or cracks in the wall; a compromised vacuum seal reduces insulation and may allow small interior corrosion.
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
- Cupture 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.