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
PossibleCap or closure contamination
PossibleBacterial or mold growth from moisture retention
Klean Kanteen
Classic Flip Seal Sport Cap
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossiblePlastic cap degradation and microplastic shedding
PossibleBacterial growth in cap seals
ReportedDurability of seal gasket
Where these two actually differ
- We flag Cap or closure contamination and Bacterial or mold growth from moisture retention on the Klean Kanteen and not on the Klean Kanteen.
- We flag Plastic cap degradation and microplastic shedding, Bacterial growth in cap seals and Durability of seal gasket 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, 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 portable water bottles, see the full ranking