Tumblers - Set of 4 vs TKWide Twist Cap Bottle: which is safer?
Klean Kanteen TKWide Twist Cap Bottle is our pick: better on PFAS and on the overall hazard picture.
Ember
Tumblers - Set of 4
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleDouble-wall separation and structural failure
PossibleLid seals and gasket materials
PossibleNickel sensitivity from stainless steel contact
Our pick
Klean Kanteen
TKWide Twist Cap Bottle
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleBacterial or mold growth in closure threads
PossibleDegradation of cap seal or gasket integrity
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