Osprey · Waterproof Outdoor Gear Storage Bags
Osprey Ultralight Dry Stuff Pack
Dry stuff pack with water-repellent coating; PFAS status unclear from brand.
Osprey's ultralight pack uses water-repellent coating-treated materials for water resistance. The brand does not publicly disclose PFAS use or alternatives, leaving treatment composition uncertain.
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Material
silicone-coated nylon, water-repellent coating treated
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 Osprey Ultralight Dry Stuff Pack is constructed from nylon fabric with a silicone coating on the exterior and water-repellent coating (water-repellent coating) treatment. Silicone coatings are chemically inert and do not leach into contents or skin under normal conditions, making them safer than some older synthetic fabric treatments. The water-repellent coating finish is where uncertainty enters: many water-repellent coating treatments historically relied on PFAS compounds (which are separately graded here), though some brands have shifted to fluorine-free or lower-PFAS alternatives. Osprey has not publicly disclosed which water-repellent coating chemistry they use in this product.
The brand's record and disclosure
Osprey Packs is a major outdoor gear manufacturer with a generally solid safety and quality reputation, but has not published comprehensive PFAS policies or material transparency statements comparable to some competitors. The brand does not appear on public lists of manufacturers committed to phasing out PFAS in textile treatments. No major recalls, contamination incidents, or disclosed health issues have been documented for Osprey dry bags in consumer databases. Their silence on water-repellent coating chemistry for this specific product leaves the PFAS exposure uncertain.
How it compares in its category
Dry bags and waterproof stuff sacks are typically lower-risk products because contents are stored inside, not applied to skin, and the bag itself does not contact food directly. Osprey's silicone-coated nylon is a standard, proven approach in the outdoor market. Competitors like Sea to Summit and Patagonia have increasingly adopted fluorine-free water-repellent coating or published PFAS reduction commitments, putting them ahead on transparency. This Osprey model offers good functionality but trails on documented material disclosure relative to some alternatives.
If you buy it
Store dry items inside (not food or personal care products in direct contact with the lining). The silicone coating does not degrade significantly in normal use and will not shed microplastics or leach under field conditions. Wash by hand with mild soap and water if needed; avoid high heat or machine drying, which could damage the coating. If you are concerned about PFAS exposure, contact Osprey directly to request water-repellent coating composition details, or consider brands with published fluorine-free commitments.
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 treatment PFAS content (see separate PFAS grade)
Silicone-nylon dry bags typically receive water-repellent coating finish. Osprey does not disclose which chemistry; legacy water-repellent coating often contained PFAS. Evaluated separately at 40/100 safety due to unclear formulation.
Microplastic shedding from coating
Silicone coatings on nylon are stable and do not degrade into microplastics under normal storage and field use. No published evidence of shedding from this product type.
Silicone leaching into stored contents
Silicone is chemically inert and does not leach into water or dry goods. No hazard documented for food or personal items stored inside.
Coating degradation and tear risk
Silicone-coated nylon can develop micro-tears or delamination after years of heavy use or improper storage (extreme heat, folding stress). Once compromised, waterproofing fails and nylon may fray, but no chemical hazard results.
Flame retardant additives in nylon substrate
Standard nylon used in outdoor dry bags is not routinely treated with flame retardants. No evidence of such treatments in Osprey's product literature or third-party testing.
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.
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.