SealLine · Waterproof Bags & Luggage
SealLine Skylake Dry Daypack
Dry daypack with unknown waterproof treatment, skip if PFAS matters.
SealLine Skylake uses water-repellent coating waterproofing but does not reveal the chemical makeup. No public lab testing or PFAS-free certification is available for this product.
The better-graded swap
Salomon
Salomon Extended Totebag
85/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Nylon pack with water-repellent coating waterproof coating, unspecified
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What SealLine Skylake Dry Daypack is made of, ingredients and materials
The Skylake is constructed from nylon fabric with a water-repellent coating (water-repellent coating) coating applied to the exterior. Nylon itself is a stable synthetic polymer with no known leaching hazards under normal use. The water-repellent coating finish is the critical unknown, it may be fluorocarbon-based (PFAS-containing) or fluorocarbon-free, but SealLine does not publicly disclose which. The coating's formulation determines both waterproofing longevity and chemical exposure risk during handling and washing.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Waterproof / stain-resistant treatment
Water-repellent coating treatments have historically used PFAS.
PFAS
SealLine does not disclose whether the Skylake uses legacy PFAS-based or modern fluorocarbon-free water-repellent coating. Unspecified coatings on outdoor nylon packs historically used Teflon-type coating or PFOA derivatives; exposure is primarily dermal contact and rinse water, not ingestion.
Source, ATSDR ↗Coating degradation and microparticle shedding
Over 2-3 years of regular use, water-repellent coating coatings can flake or powder, especially with washing or abrasion. Inhalation risk is low for outdoor use, but accumulation in homes with poor ventilation is theoretically possible; no documented cases for this product.
What’s reassuring
Dyes and colorants in nylon fabric
Nylon dyes are typically azo-based but well-fixed to fiber. No testing or complaints on record for the Skylake; azo dye leaching from packs is not a recognized hazard class in regulatory or consumer safety literature.
Polyurethane seam tape or adhesives
Many waterproof packs use polyurethane seam sealant, which can off-gas VOCs (volatile organic compounds) when new. The Skylake's construction details are not publicly available; if present, odor dissipates within days to weeks indoors with ventilation.
Heavy metals
Aluminum and zinc alloy hardware are standard and non-toxic. No lead or cadmium contamination is documented for SealLine packs or their suppliers; daypacks rarely trigger heavy-metal testing.
Source, FDA ↗How is this PFAS grade calculated?
The brand's record and disclosure
SealLine (owned by Cascade Designs) does not publish material safety data sheets or fluorochemical disclosures for consumer daypacks. The brand has not signed onto PFAS-reduction commitments like the ZDHC Gateway or similar initiatives that would signal transparency. No recalls or regulatory actions are on record for SealLine packs related to coating hazards. This silence makes independent assessment of chemical content impossible.
How it compares in its category
Most lightweight daypacks in this price range use similar nylon + water-repellent coating construction, so the Skylake is typical rather than exceptional in material safety profile. Brands like Patagonia and Arc'teryx increasingly disclose water-repellent coating chemistry or offer PFAS-free options; SealLine's lack of transparency puts it behind category leaders. For dry bags and waterproof packs, this approach is standard practice, but that does not eliminate the underlying uncertainty.
If you buy it
Wash by hand with cool water and mild detergent only; machine washing and high heat degrade the water-repellent coating finish and may mobilize coating compounds into rinse water. Do not use commercial waterproofing re-treatments unless their composition is verified fluorocarbon-free. Store dry and away from direct sunlight to extend coating life. Replace the pack if the water-repellent coating visibly fails (water no longer beads) or coating flakes, as a deteriorated finish may release particles.
What is not known about PFAS in this product?
- Basis
- Model estimate, 35% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- SealLine has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to SealLine Skylake Dry Daypack?
- Cordura nylon fabric
- We found no PFAS statement from the brand
- Heavy metals
- Polyester webbing and nylon
- Azo dyes in polyester webbing
4 hazards checked on this product, all on its full breakdown.
- Polypropylene shell, polyurethane foam, stainless steel hardware
- Polyurethane foam degradation and off-gassing
More waterproof bags & luggage 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.