Guide Series Waterproof Case 3600 vs K470 Aluminum Storage Case 40845: which is safer?

zarges K470 Aluminum Storage Case 40845 is the clear pick. Guide Series Waterproof Case 3600 carries a failing PFAS grade, and we never recommend buying a failing product.

Plano

Guide Series Waterproof Case 3600

PFAS grade

F 40/100

Overall grade

F 28/100

Verdict

Skip

Hazard flags

⚑ 3

Material

Polymer case with waterproof coating

Confidence

35%

PossiblePFAS in waterproof coating

PossibleCoating degradation and leaching

PossibleMigration to stored contents

Why this grade

Our pick

Zarges

K470 Aluminum Storage Case 40845

PFAS grade

B 85/100

Overall grade

C 77/100

Verdict

Buy

Hazard flags

⚑ 2

Material

Aluminum with rubber gasket/hinges

Confidence

78%

PossibleAluminum corrosion and leaching

PossibleBacterial or mold growth in seal

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 →

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