Sea to Summit · Waterproof Outdoor Gear Bags
Sea to Summit Lightweight Dry Bag View
Waterproof dry bag; water-repellent coating treatment PFAS risk unclear, no disclosure.
Sea to Summit does not disclose PFAS use in this dry bag's waterproof coating. Polyurethane dry bags may contain legacy PFAS in their water-repellent finish, but specifics are unknown.
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Material
polyurethane-coated nylon with water-repellent coating treatment
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
No PFAS disclosure
No public statement about PFAS in this product.
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
Category baseline
clothing is a category where PFAS exposure is more common.
The full breakdown
What it's made of and why it matters
This bag uses polyurethane-coated nylon with a water-repellent coating (water-repellent coating) finish. The polyurethane coating itself is not inherently toxic, but water-repellent coating treatments, especially on outdoor gear, historically rely on fluorinated compounds (PFAS) for water and oil resistance. Sea to Summit has not publicly disclosed whether this product uses PFAS-based or PFAS-free water-repellent coating; the silence itself is the risk signal. The nylon substrate and polyurethane layer are stable materials when not degraded.
The brand's record and disclosure
Sea to Summit does not maintain a published PFAS disclosure policy or transparency report specific to their waterproof products. The brand has not publicly committed to phasing out PFAS-based water-repellent coating treatments. This absence of communication is common among outdoor gear manufacturers but contrasts with competitors (Patagonia, Arc'teryx) that have begun disclosing or transitioning to PFAS-free alternatives. Without direct contact with the brand, you cannot confirm the water-repellent coating chemistry used.
How it compares in its category
Dry bags are a niche category; this product's lightweight design and visible window are competitive features, but the material class (polyurethane-coated nylon with unknown water-repellent coating) is typical of mid-range offerings. Higher-end brands increasingly market PFAS-free water-repellent coating; lower-cost alternatives often use similar unspecified treatments. Sea to Summit sits in the middle without transparency, neither leading on safer chemistry nor clearly stating PFAS presence.
If you buy it
Store in a cool, dry place away from direct heat or prolonged sunlight, as polyurethane can degrade and off-gas under UV and thermal stress. Do not wash with detergents designed to strip water repellency, as this may reduce water-repellent coating durability. If the product shows peeling, cracking, or clouding of the coating, consider replacement to avoid microplastic shedding and coating failure. Contact Sea to Summit directly if PFAS presence is a dealbreaker for you; pressure for disclosure may prompt future transparency.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
PFAS in water-repellent coating treatment (fluorinated water repellent)
water-repellent coating finishes on nylon commonly use PFAS compounds for extended performance, but Sea to Summit provides no public disclosure. Risk level depends on whether product uses legacy PFAS-based or newer PFAS-free chemistry, not confirmed from available information.
Polyurethane coating degradation and off-gassing
Polyurethane coatings can release volatile organic compounds (VOCs) and degrade under UV, heat, and mechanical stress, particularly if stored in hot conditions or near direct sunlight. Lightweight dry bags with thin coatings may off-gas more readily than thicker industrial polyurethane products.
Microplastics from coating wear
As the polyurethane coating ages and flexes, it can shed microplastics into water or soil, especially if packed with abrasive contents or washed aggressively. This is a general concern for coated textiles, not unique to this brand, but accelerated by improper storage or care.
Formaldehyde in nylon finishing or dyes
No public record of formaldehyde-based finishes or problematic dye lots in Sea to Summit dry bags. Nylon itself does not require formaldehyde; however, some industrial nylon finishing processes may involve formaldehyde resins, not documented for this product.
Heavy metals in polyurethane pigments or additives
Sea to Summit does not list heavy metal testing results for this product. Standard polyurethane coatings and nylon do not typically contain lead or cadmium unless contaminated during manufacture, which has not been reported for this brand.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 35% 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 Gear Bags
Marmot
Tool Box
Nylon, polyester, cotton blend; details unspecified
Toolbox, not garment. Check product specs for water-repellent coating.
⚠Risky category by default
More waterproof outdoor gear bags 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.