Cold Tumbler vs TKWide Twist Cap Bottle: which is safer?
These two grade almost identically. Pick on price and preference; neither has a PFAS edge.
Ember
Cold Tumbler
PFAS grade
A 100/100
Overall grade
A 92/100
Verdict
Buy
Hazard flags
⚑ 2
Material
stainless steel with silicone seal
Confidence
72%
PossibleSilicone seal degradation and microbial growth
PossibleCoatings or adhesives on printed logos
Klean Kanteen
TKWide Twist Cap Bottle
PFAS grade
A 100/100
Overall grade
A 92/100
Verdict
Buy
Hazard flags
⚑ 2
Material
Stainless steel body, plastic cap
Confidence
78%
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