Granite Gear · Waterproof Outdoor Gear Bags
Granite Gear eVent Sil Drysack
Silent on PFAS; eVent membrane source unclear. Request details.
Granite Gear does not disclose PFAS use or testing. eVent is a Teflon-family coating membrane; coating chemistry unconfirmed. Recommend contacting brand directly before purchase.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Silicone-coated nylon with eVent membrane
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 silicone-coated nylon as its outer shell paired with an eVent microporous membrane for breathability while maintaining water resistance. The silicone coating replaces traditional polyurethane and provides flexibility and durability. eVent is a laminated membrane technology with a base polymer and thin polytetrafluoroethylene (Teflon-type coating) layer, which raises questions about Teflon-type coating content and PFAS chemistry that Granite Gear has not publicly clarified. The nylon substrate itself is stable and poses no known baseline hazard when properly treated.
The brand's record and disclosure
Granite Gear is a Colorado-based outdoor gear manufacturer without publicly available PFAS policy, material transparency reports, or third-party certifications such as bluesign or GOTS. The brand does not disclose membrane supplier details, eVent coating composition, or chemical treatment processes on product pages or sustainability statements. No recalls or documented chemical safety incidents are on record for this model. Silence on PFAS and membrane sourcing is a gap in consumer information, not evidence of harm.
How it compares in its category
Silicone-coated nylon with eVent is mid-range in the drysack/waterproof bag segment. Many competitors use traditional polyurethane coatings (also PFAS-prone) or proprietary membrane systems with equally opaque sourcing. Some premium brands (e.g., Patagonia, Arc'teryx) publish PFAS commitments and membrane sourcing; budget brands rarely do. The eVent choice indicates breathability prioritization, which is functionally superior to non-breathable alternatives but does not resolve the PFAS disclosure gap.
If you buy it
Store in a cool, dry place away from direct UV and high heat, as silicone and Teflon-type coating-based coatings can degrade if exposed to sustained temperatures above 60-70 degrees Celsius (140-160 Fahrenheit). Do not machine wash or expose to solvents; rinse with cool water and air dry. Inspect the seams and membrane surface annually for cracking, peeling, or loss of water beading; replacement is advisable if coating integrity fails visibly. Request eVent membrane and silicone treatment details from Granite Gear before purchase if PFAS exposure is a personal concern.
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.”
Teflon-type coating fume risk (separate from PFAS grading)
eVent membranes use Teflon-type coating in laminate; if exposed to temperatures above 260°C (500°F), Teflon-type coating can release fumes. Normal drysack use does not reach this threshold, but exposure to fire, stovetops, or direct flame poses theoretical risk. Practical exposure is very low for a stored bag.
Coating degradation and microfiber shedding
Silicone and Teflon-type coating-laminate coatings are durable but can flake or shed microparticles when abraded, wrinkled for extended periods, or aged. Shed particles may be breathed or ingested if bag contents contact food. Risk is minor under normal use but increases with wear and age.
Nylon fabric formaldehyde resins (treatment)
No formaldehyde-based resin finishes are typical on modern silicone-coated nylon drysacks. Granite Gear does not advertise such treatments. Standard nylon in waterproof bags is not a known source of formaldehyde release.
Dye or colorant heavy metals
Nylon drysacks are dyed at the fiber stage; Granite Gear does not disclose dye chemistry. No recalls or test failures for heavy metals in this product or brand line are on record. Risk is consistent with standard outdoor nylon textiles.
Membrane delamination and loss of water resistance
eVent laminates can separate from base fabric under repeated flexing, washing, or age, particularly if exposed to solvents or heat. User reviews and forums document occasional early delamination in eVent gear, though not specific to Granite Gear model. Occurs as wear, not acute hazard, but reduces product lifespan and function.
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.