Cup 14 oz Slate Black 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.
Ember
Cup 14 oz Slate Black
PFAS grade
A 100/100
Overall grade
B 86/100
Verdict
Buy
Hazard flags
⚑ 2
Material
Ceramic or ceramic-coated stainless steel with heated base
Confidence
72%
PossibleCeramic coating degradation and heavy metal release
ReportedMaterial disclosure and transparency gaps
Our pick
Klean Kanteen
20oz TKWide with Café Cap, Tofu
PFAS grade
A 100/100
Overall grade
B 88/100
Verdict
Buy
Hazard flags
⚑ 3
Material
Stainless steel bottle, stainless steel cap
Confidence
85%
PossibleSilicone gasket degradation
PossibleBacterial colonization in seals
PossibleOff-gassing or odor transfer
Both products run through the same public rubric: 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 travel drinkware: see the full ranking