40oz Stainless Steel Tumbler vs 20oz TKWide with Café Cap, Tofu: which is safer?
Klean Kanteen 20oz TKWide with Café Cap, Tofu is our pick, better on PFAS and on the overall hazard picture.
40oz Stainless Steel Tumbler
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleNickel leaching (stainless steel alloy)
PossibleLid gasket and seal degradation
PossibleBacterial or mold growth in insulation gap
Our pick
Klean Kanteen
20oz TKWide with Café Cap, Tofu
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossiblePowder-coat cap degradation over time
PossibleBacterial biofilm in cap threads and seals
PossibleThermal stress on seals at extreme temperatures
Where these two actually differ
- We flag Nickel leaching (stainless steel alloy), Lid gasket and seal degradation and Bacterial or mold growth in insulation gap on the and not on the Klean Kanteen.
- We flag Powder-coat cap degradation over time, Bacterial biofilm in cap threads and seals and Thermal stress on seals at extreme temperatures on the Klean Kanteen and not on the .
- The is Stainless steel, bare uncoated where the Klean Kanteen is Stainless steel bottle, stainless steel cap, which is most of the difference in these two grades.
Both products run through the same public rubric, which covers materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More insulated drink tumblers, see the full ranking