27oz Wide Water Bottle with Loop Cap vs OTF Water Bottle: 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
Nalgene
OTF Water Bottle
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossiblePlastic leaching from thermal stress
PossibleMicroplastics from friction or breakdown
PossibleBacterial growth in cap or seals
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 Nalgene.
- We flag Plastic leaching from thermal stress, Microplastics from friction or breakdown and Bacterial growth in cap or seals on the Nalgene and not on the Klean Kanteen.
- The Klean Kanteen is 18/8 stainless steel, no interior coating where the Nalgene is BPA-free Eastman Tritan copolyester plastic, which is most of the difference in these two grades.
- The gap is 30 points, wide enough that this is not a close call, and the Klean Kanteen is the one to buy.
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