Osprey · Waterproof Outdoor Gear Storage Bags
Osprey Metron Waterproof Roll Top Backpack
Waterproof backpack; PFAS content in water-repellent coating unknown.
Osprey does not disclose PFAS use or waterproofing treatment details for this roll-top pack. water-repellent coating coatings often contain PFAS, but specifics remain unclear from public sources.
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Material
Nylon fabric with unspecified water-repellent coating waterproof 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
other 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
The Metron uses nylon fabric treated with an unspecified water-repellent coating (water-repellent coating) coating to achieve waterproofing without a sealed seam. Nylon itself is a stable synthetic polymer with no established leaching risk under normal use. The water-repellent coating is the critical unknown: historically, water-repellent coating treatments have used long-chain PFAS (like PFOA/PFOS), shorter-chain PFAS alternatives, or fluorine-free formulations. Osprey has not publicly disclosed which chemistry they employ, making the hazard profile incomplete.
The brand's record and disclosure
Osprey does not maintain a publicly visible chemical transparency or PFAS disclosure policy on their website or sustainability reports. The brand has not pursued third-party certifications (Oeko-Tex, bluesign, or GOTS) that would verify chemical composition. No product recalls related to chemical hazards have been documented for Osprey backpacks. This silence on water-repellent coating chemistry is typical across outdoor gear brands but represents a significant gap in consumer information.
How it compares in its category
Most waterproof roll-top backpacks under USD 150 use similar nylon-plus-water-repellent coating constructions with undisclosed coatings. Higher-end competitors (Patagonia, Arc'teryx) increasingly disclose PFAS-free water-repellent coating alternatives or fluorine-free options. The Metron is mid-market; its lack of transparency is common but not a differentiator. If PFAS exposure during use or care is a concern, requesting material safety data from Osprey or choosing brands with documented fluorine-free water-repellent coating would be more protective.
If you buy it
Do not machine wash or expose to high heat (over 65 C/150 F), which can degrade nylon and potentially mobilize coating compounds. Hand wash with mild soap and air dry flat. Inspect seams and coating annually for wear; small tears can compromise waterproofing and may allow ingress of unrinsed detergent. Store in a dry place away from direct sunlight to slow UV degradation. Consider contacting Osprey directly to request water-repellent coating material safety data before purchase if PFAS minimization is a priority.
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 composition (non-PFAS unknown)
Unspecified durable-water-repellent treatment may contain short-chain PFAS, fluorine-free alternatives, or legacy long-chain PFAS. No public disclosure allows assessment only of risk category, not actual chemical.
Nylon degradation under UV and heat
Nylon itself does not leach harmful substances under normal backpack use. Degradation fragments are microplastics but not acutely hazardous in outdoor fabric applications.
Azo dyes in colored nylon
No specific test results or recalls for the Metron indicate hazardous azo dyes. Osprey nylon is typically solution-dyed or uses standard commercial dyes without documented issues.
Coating durability and re-application
water-repellent coating coatings on nylon backpacks degrade with washing and UV exposure; reapplication products often contain PFAS or fluorinated compounds. Long-term waterproofing maintenance may introduce chemical exposure.
Off-gassing or volatile organic compounds (VOC)
No off-gassing complaints or VOC testing on record for Osprey nylon backpacks. Nylon and standard water-repellent coating finishes do not typically emit reportable volatiles under typical storage or use conditions.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 35% 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.
More 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.