27oz Wide Water Bottle with Loop Cap vs Classic Flip Seal Sport Cap: which is safer?
Klean Kanteen 27oz Wide Water Bottle with Loop Cap is our pick: better on PFAS and on the overall hazard picture.
Our pick
Klean Kanteen
27oz Wide Water Bottle with Loop Cap
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleNickel leaching from stainless steel
PossibleSurface corrosion and pitting over time
PossibleBacterial growth in cap seals
Klean Kanteen
Classic Flip Seal Sport Cap
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossiblePlastic cap degradation and microparticles
PossibleCap seal/gasket off-gassing or contamination
PossibleBacterial growth in cap crevices
Where these two actually differ
- We flag Nickel leaching from stainless steel, Surface corrosion and pitting over time and Bacterial growth in cap seals on the Klean Kanteen and not on the Klean Kanteen.
- We flag Plastic cap degradation and microparticles, Cap seal/gasket off-gassing or contamination and Bacterial growth in cap crevices on the Klean Kanteen and not on the Klean Kanteen.
- The Klean Kanteen is 18/8 stainless steel, no interior coating where the Klean Kanteen is Stainless steel bottle, plastic flip cap, which is most of the difference in these two grades.
- These two are 5 points apart, close enough that price and fit should decide it rather than our grade.
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 portable water bottles: see the full ranking