Tool Box vs Ultra Sil Dry: which is safer?

Marmot Tool Box is our pick: better on PFAS and on the overall hazard picture.

Our pick

Marmot

Tool Box

PFAS grade

D 65/100

Overall grade

F 39/100

Verdict

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Hazard flags

⚑ 5

Material

Nylon, polyester, cotton blend; details unspecified

Confidence

45%

PossibleVolatile organic compounds (VOCs) from polyester and nylon manufacturing

Reportedwater-repellent coating (water-repellent coating) coating chemistry unknown

PossibleFormaldehyde-resin finishes in synthetic textiles

Why this grade

Sea to Summit

Ultra Sil Dry

PFAS grade

F 20/100

Overall grade

F 2/100

Verdict

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Hazard flags

⚑ 3

Material

ripstop nylon with silicone or polyurethane coating

Confidence

62%

PossibleVolatile organic compound (VOC) off-gassing from polyurethane coating

ReportedCoating degradation and microplastic shedding over time

PossibleSkin contact irritation or sensitization from coating or residual chemicals

Why this grade

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 waterproof outdoor gear bags: see the full ranking