20 oz Carbon Stainless Steel Filtered Water Bottle vs 24oz Wide Mouth Flex Straw Cap: which is safer?

Brita 20 oz Carbon Stainless Steel Filtered Water Bottle is our pick: better on PFAS and on the overall hazard picture.

Our pick

Brita

20 oz Carbon Stainless Steel Filtered Water Bottle

PFAS grade

A 100/100

Overall grade

A 92/100

Verdict

Buy

Hazard flags

⚑ 2

Material

Stainless steel bottle with activated carbon filter cartridge

Confidence

72%

PossibleBacterial/microorganism growth in filter cartridge

PossibleFilter cartridge housing degradation over time

Why this gradeBuy

Hydro Flask

24oz Wide Mouth Flex Straw Cap

PFAS grade

A 100/100

Overall grade

C 78/100

Verdict

Buy

Hazard flags

⚑ 4

Material

Stainless steel bottle; polymer cap and straw

Confidence

72%

PossiblePolymer cap/straw composition opacity

ReportedBacterial growth in cap seals

PossibleRubber gasket degradation over time

Why this gradeBuy

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 filtered water bottles: see the full ranking