Wren Waterproof Storage Case vs K470 Aluminum Storage Case 40845: which is safer?
zarges K470 Aluminum Storage Case 40845 is the clear pick. Wren Waterproof Storage Case carries a failing PFAS grade, and we never recommend buying a failing product.
Storm Case
Wren Waterproof Storage Case
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleWaterproof coating leachates (non-PFAS)
PossibleCoating degradation and particle release
PossibleOff-gassing from plastic or adhesives
Our pick
Zarges
K470 Aluminum Storage Case 40845
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleAluminum corrosion and leaching
PossibleBacterial or mold growth in seal
Where these two actually differ
- We flag Waterproof coating leachates (non-PFAS), Coating degradation and particle release and Off-gassing from plastic or adhesives on the Storm Case and not on the Zarges.
- We flag Aluminum corrosion and leaching and Bacterial or mold growth in seal on the Zarges and not on the Storm Case.
- The Storm Case is rigid plastic case with waterproof coating where the Zarges is Aluminum with rubber gasket/hinges, which is most of the difference in these two grades.
- The gap is 45 points, wide enough that this is not a close call, and the Zarges is the one to buy.
- We are less certain about the Storm Case grade, at 35% confidence against 78%, because it discloses less.
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 →
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