PFAS score
Sea to Summit · Waterproof Outdoor Accessories
SEA TO Summit Ultra-Sil Pack Cover
PFC-free claim stated. No independent verification available yet.
Sea to Summit markets Ultra-Sil pack covers with a PFC-free water-repellent coating finish. No third-party lab testing or certification found to confirm the claim independently.
Brand says: “Sea to Summit uses PFC-free DWR finish on Ultra-Sil pack covers”
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
nylon with silicone water-repellent coating
Brand disclosure
Brand claims PFAS-free
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.
Brand-stated PFAS-free
The brand states the product is PFAS-free (self-declared).
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% 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.
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
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.