27oz Wide Water Bottle with Loop Cap vs 32oz Wide Mouth Ultralite 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
32oz Wide Mouth Ultralite Bottle
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleMicroplastics shedding under thermal or mechanical stress
PossibleBacterial biofilm growth inside bottle (storage-related hazard, not material hazard)
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 Microplastics shedding under thermal or mechanical stress and Bacterial biofilm growth inside bottle (storage-related hazard, not material hazard) on the Nalgene and not on the Klean Kanteen.
- The Klean Kanteen is 18/8 stainless steel, no interior coating where the Nalgene is Tritan copolyester plastic (BPA-free), 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