PFAS score
Sea to Summit · Waterproof Outdoor Accessories
Sea To Summit Ultra- Sil Dry Bag
Dry bags likely use silicone coatings, but PFAS status unclear from brand.
Sea to Summit's Ultra-Sil bags use silicone-based waterproof coatings; PFAS content not disclosed by brand. No third-party testing available to confirm safety.
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Material
Silicone-based coated nylon or polyester fabric
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
Category baseline
clothing is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 55% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Waterproof Outdoor Accessories
Sea to Summit
Ultra- Sil Stuff Sack Set
Ultra-Sil nylon fabric, no water treatment applied
Stuff sack with no waterproofing treatment.
⚠Risky category by default
Sea to Summit
Ultra-Sil Pack Cover
nylon with silicone water-repellent coating
PFC-free claim stated. No independent verification available yet.
⚠Waterproof or stain-proof treatment
More waterproof outdoor accessories grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.