SealLine · Waterproof Outdoor Gear Storage Bags
SealLine Pro Dry Pack
Skip until brand discloses waterproof coating.
SealLine Pro Dry Pack is waterproofed, but the brand won't disclose what coating material they use or whether PFAS is in it. Waterproof treatments often rely on PFAS, so silence is a red flag.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Nylon or polyester with waterproof coating, composition unspecified
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What SealLine Pro Dry Pack is made of, ingredients and materials
SealLine Pro Dry Packs are constructed from nylon or polyester (material varies by model) with an applied waterproof coating. The specific chemistry of that coating is not disclosed by the brand. Waterproof technical fabrics typically rely on fluorocarbon compounds (PFAS-family) or polyurethane to achieve water resistance, and SealLine's silence on this detail, combined with its PFAS safety grade of 20/100, strongly suggests fluorocarbon-based treatment. The coating itself does not off-gas significantly in normal use, but durability and eventual degradation introduce leaching and microfiber concerns.
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.
Waterproof coating degradation and leaching
Unidentified waterproof coatings on nylon/polyester degrade over time, particularly with heat, UV, or physical wear. Fragments and chemical leachates may contaminate stored food or water if seams fail. No independent test data exists for this product, but the material class is inherently vulnerable.
Microfiber shedding from fabric
Nylon and polyester textiles shed microfibers when abraded or washed. SealLine Pro bags are not washed frequently by most users, reducing exposure, but outdoor use and packing friction will cause minor fiber loss over years. Risk is low but not zero, especially if bag contents are later consumed.
What’s reassuring
Formaldehyde / VOCs
No evidence of formaldehyde-based treatments on record for SealLine dry bags. The nylon or polyester substrate and waterproof coating do not typically require formaldehyde fixatives, but lack of certification means it cannot be ruled out entirely.
Source, ATSDR ↗Seam sealant toxicity
Seam-sealed dry bags may use polyurethane or acrylic adhesives; SealLine does not specify. In normal outdoor storage use, seam sealants do not leach into food or water unless the bag is submerged or degraded. No documented hazard for this product.
Antimony in polyester
Polyester fabrics may contain antimony trioxide as a polymerization catalyst. SealLine does not confirm material composition or catalyst type. Antimony is a minor concern in polyester textiles but does not migrate into contents under normal use.
How is this PFAS grade calculated?
The brand's record and disclosure
SealLine has not publicly disclosed the chemical identity of its waterproof coatings or stated a position on PFAS avoidance. No certifications (such as OEKO-TEX or bluesign) are advertised for this product line. The brand has no documented recalls related to chemical hazards in dry bags. The absence of transparency on coating chemistry is the primary red flag; reputable outdoor brands increasingly publish such information or commit to PFAS-free alternatives.
How it compares in its category
Waterproof dry bags universally require a water-resistant coating or laminate. Most mainstream brands (including SealLine competitors) rely on fluorocarbon-based treatments unless explicitly stated otherwise. A few alternatives marketed as PFAS-free exist, typically using polyurethane or silicone coatings, but cost more and may have shorter service life. SealLine Pro Dry Packs are mid-range in price and performance; they are neither exceptional nor outliers in their reliance on unspecified hydrophobic treatments.
If you buy it
Do not expose the bag to prolonged heat above 60C (140F), as coatings may degrade prematurely and leach compounds. Rinse the exterior after saltwater or contaminated-water exposure to reduce biofilm and microbial colonization in creases and seams. Inspect seams and coatings annually for tears, peeling, or degradation; once coating fails, waterproofing is lost and leaching risk rises. Plan replacement every 3-5 years depending on use frequency. Until SealLine discloses its coating chemistry, consider this a temporary storage solution rather than a long-term investment.
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 Pro Dry Pack?
- Polypropylene storage bin, no water-resistant coating mentioned
- UV degradation and additive leaching
3 hazards checked on this product, all on its full breakdown.
Find an alternative on Amazon
- Nylon, polyester, cotton blend; details unspecified
- Volatile organic compounds (VOCs) from polyester and nylon manufacturing
5 hazards checked on this product, all on its full breakdown.
Find an alternative on Amazon
- Recycled polyester with water-repellent coating (water-repellent coating) finish
- The brand calls it PFAS-free, which we have not verified
- PFAS
4 hazards checked on this product, all on its full breakdown.
Find an alternative on AmazonMore waterproof outdoor gear storage 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.