Sea to Summit · Waterproof Outdoor Gear Bags
Sea to Summit Lightweight Dry Bag
Waterproof dry bags typically use PFAS water-repellent coating; check tag for material specifics.
Sea to Summit does not disclose PFAS in this product. Lightweight dry bags commonly employ water-repellent coating coatings that often contain PFAS; material details unavailable publicly.
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Material
Nylon fabric with waterproof water-repellent coating
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.
The full breakdown
What it's made of and why it matters
Sea to Summit's Lightweight Dry Bag uses nylon fabric with a water-repellent coating (water-repellent coating) coating to achieve waterproofing without full lamination. The water-repellent coating treatment is applied to the fabric surface to shed water while remaining breathable. Nylon itself is a stable synthetic polymer with low inherent toxicity, but the water-repellent coating chemistry is the critical variable. Most commercial dry bags in this weight class use fluorinated water-repellent coating (PFAS-based), though some brands have shifted to fluorine-free alternatives; Sea to Summit's specific formulation is not publicly disclosed.
The brand's record and disclosure
Sea to Summit is an established outdoor gear manufacturer with general reputation for quality but maintains minimal public disclosure on chemical composition and water-repellent coating type. The brand does not appear on major PFAS-free certifications or sustainability initiatives that would clarify their waterproof coating chemistry. No significant product recalls or safety controversies are documented in public records for this product line. Transparency regarding water-repellent coating composition remains a gap; contacting the manufacturer directly is recommended if PFAS exposure is a decision factor.
How it compares in its category
Nylon dry bags with water-repellent coating are the industry standard for lightweight waterproofing and represent the middle ground between fully laminated (heavier, more durable) and uncoated (lighter, less water-resistant) options. Sea to Summit's product is typical for the segment; competitors like Osprey and Patagonia offer similar constructions, though some eco-focused brands now advertise fluorine-free water-repellent coating. Price and weight are competitive, but chemical transparency is not a differentiating strength across most manufacturers in this category.
If you buy it
Wash by hand with cool water and mild soap; avoid machine washing and hot water, which can degrade the water-repellent coating and increase leaching risk. Do not tumble dry or expose to direct heat sources. Reapply water-repellent coating treatment every 12-24 months depending on use frequency; commercial water-repellent coating sprays are available but introduce the same chemical exposure question. Inspect the bag for coating wear (water no longer beads) and seam integrity before long trips; replacement is recommended when water penetration occurs despite treatment.
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.”
water-repellent coating degradation and leaching
As the nylon water-repellent coating wears through repeated use and washing, residual coating chemicals and breakdown products may leach from fabric fibers, particularly when wet. Risk increases with age and UV exposure; heavily used bags show visible coating failure within 2-3 years.
Formaldehyde resins in nylon finishing
Nylon itself does not typically contain formaldehyde resins (these are more common in cotton blends and wrinkle-resistant treatments), but finishing processes may introduce trace amounts. No specific issues documented for Sea to Summit nylon bags.
Azo dyes in colored fabric
If the dry bag uses synthetic dyes (common for nylon), azo dyes are a potential concern; however, most modern gear manufacturers use compliant dye formulations. The risk is low unless the bag shows unusual dye transfer when wet or rubbed. Sea to Summit products are not flagged in public safety databases for dye issues.
Microplastic shedding from synthetic fabric
Nylon sheds microfibers during use and washing, particularly from abraded seams and high-friction areas. Dry bags are not typically heated, which limits microplastic release compared to laundry, but shedding during storage, packing, and unpacking is inevitable; environmental impact occurs primarily through washing.
Antimony in polyester components (seams/straps)
Sea to Summit Lightweight Dry Bags use nylon as the primary material; polyester is not listed as a primary component. If reinforcement seams or handles include polyester thread, antimony (used as a polymerization catalyst) is theoretically present but at negligible levels in consumer products.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 45% 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.