Granite Gear · Waterproof Outdoor Gear Bags
Granite Gear eVent Sil Compression DrySack
Waterproof coating source unclear; brand silent on PFAS.
This compression drysack uses eVent laminate for waterproofing, a proprietary technology whose PFAS content is not publicly disclosed. Granite Gear provides no transparency on PFAS in this product.
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Material
Nylon with eVent laminate and silicone 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
This drysack uses nylon as the base fabric with an eVent laminate (a breathable polyurethane membrane) and a silicone topcoat. The silicone is added for water resistance and durability without the breathability loss of full film laminates. Nylon itself is stable and low-toxicity; the concern is what chemical treatments or waterproofing agents were applied to achieve water repellency, silicone coatings are generally safer than Teflon-type coating or wax-based treatments, but the eVent lamination underneath may contain processing aids or finishes not fully disclosed.
The brand's record and disclosure
Granite Gear is a US-based outdoor brand with a modest reputation for durability but limited public transparency on chemical composition or PFAS use. The company does not publish detailed material safety data sheets or supply-chain certifications (like OEKO-TEX or bluesign) for this product. No major recalls or health controversies are on record for Granite Gear compression sacks, but the brand's silence on waterproofing method and PFAS status is a transparency gap typical of mid-tier outdoor manufacturers.
How it compares in its category
Compression drysacks in this price and performance tier typically use nylon with either silicone, polyurethane, or TPU coatings. Silicone is a middle-ground choice, safer than Teflon-type coating (which off-gases when heated) and more durable than wax, but less water-repellent than PFC-based finishes. Competitors like Stuff Sack or Sea to Summit models often face the same PFAS opacity. This product is not unusual in its lack of disclosed waterproofing; it is more common than certified PFAS-free alternatives like those using paraffin or ceramic coatings.
If you buy it
Store the bag in a cool, dry place away from direct heat and UV; nylon degrades over extended sun exposure. Do not machine wash; hand rinse with cool water and mild soap, then air dry. Avoid dry cleaning or heat drying (above 60 C/140 F), which can delaminate the eVent layer. Replace the bag if the silicone coating visibly peels or cracks, as water ingress will compromise the seal and accelerate material breakdown. Monitor for odor or staining after years of use; while not a safety signal, it may indicate mold growth if moisture seeped inside despite the coating.
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.”
Formaldehyde resins in textile finishing
Nylon compression sacks do not typically use formaldehyde-based wrinkle-resist or antimicrobial finishes. No evidence of such treatments in this product line or manufacturer specs.
Azo dyes (color fastness and allergen risk)
The product comes in standard outdoor colors (gray, black, etc.). No recalls or reports of azo dye contamination in Granite Gear nylon products; dyeing is routine and low-risk in reputable outdoor textiles.
Antimony in polyester fiber
This product is nylon-based, not polyester, so antimony catalyst contamination is not a concern. The eVent laminate is polyurethane, not polyester.
Flame retardant chemicals in coating or laminate
Compression drysacks are not required to meet flame retardancy standards, and silicone coatings are inherently flame-resistant. However, the polyurethane eVent layer could theoretically contain flame retardant additives for processing safety; no specific data on this product is publicly available, and the risk is low for a non-flammable outdoor item.
Coating degradation and microparticle shedding over time
Silicone coatings on nylon progressively wear with compression cycles, UV exposure, and abrasion. No acute toxicity from shed particles, but coating loss leads to water ingress and potential mold growth inside the bag. Lifespan is typically 5-10 years with normal use.
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.